Articles, Blog

Crash Course Big History #1: The Big Bang

September 6, 2019

Hi, I’m John Green, and this
is Crash Course Big History in which we’ll be looking at the
history of, like, everything. I’m talking about
13.8 billion years– from the Big Bang to now. I mean, in this series, we are
literally going to attempt to tell you the story of what
Douglas Adams famously called:>>Mr. Green, Mr. Green! That’s not history,
that’s science. And science is for nerds. Oh, me from the past, things
would be so much easier for you if you would
just accept that you are, in fact, a nerd and that’s okay. I mean, look at
this picture, dude. Anyway, academics often
describe history as, like, all the stuff
that’s happened since we started
writing things down, but they only start there because that’s where we have
the best information. And, yeah, I think
that the advent of writing was a huge deal,
obviously, but as a start date for history,
it’s totally arbitrary. It’s just a line we drew
in the sand and said, “Okay, history begins now!” In Big History, we’re going
to start history when it really starts–
at least, we think– at the creation of the Universe. And we’re going to end
that story where it ends. Please let that be after I die. Well, I guess it will definitely
be after I die, it’s just, I want it
to be a while after I die. So we’re even going to terrify
traditional historians by using physics to make some
predictions about the future and we’re going to end many
trillions and trillions of years from now
when the Universe itself– spoiler alert– dies, at least
in a manner of speaking. Hey!
I’m not John. If you’re thinking we look a
little bit the same, that’s because we’re brothers. I’m Hank. Anyway, if you want to learn
the 13.8-billion-year history of the Universe in the same
amount of time that we usually cover the 238
years of American history, you’re not going to get
the same resolution. Of course, knowing
the names and dates of American history
is important, but we just can’t do that
in Big History. As you zoom out, you see a lot
more of the picture. The details get a little fuzzy,
but we quickly realize that history is everything–
cosmology, geology, biology, social sciences,
literature, physics. Everything. You might think that such
a scale would be filled with way too much detail, but the amount of detail
an answer requires depends on the nature of the question. Some questions can only be
explored by zooming out. That is what Big History does. Speaking of zoomed out,
this is”Earthrise,” one of the most famous
photographs of all time. William Anders,
an Apollo astronaut, took it in 1968. From the surface
of another world, we see our planet
as a little ball in space. No borders, no people,
no buildings, just oceans and clouds
and continents being shined upon by the sun. That sheer expansion of scale
gives me perspective. It lets me imagine all the
complexity of life on Earth, from the gasoline engine
that powered my trip to the studio,
to political instability in Nepal as part of a thriving,
living, teeming mass of life loading in the emptiness
of space. So what that photograph
does for physical space, Big History aims
to do for everything. I mean, we want to contextualize
all of existence. We want to outline
the most powerful and important breakthroughs, the
tremendous scale of existence, and how we know what we know,
and why we’re sure we know it. All right, let’s go
to the Thought Bubble. So, the Universe is big–
like, really big– and it’s also old–
like, 13.8 billion years old. Which is enough years
that there is no way to actually comprehend it,
so let’s just compress that age to 13 years– small enough that our puny
brains can handle it. On that time scale, the Universe
would have begun 13 years ago, in 2001. George W. Bush had just been
sworn in as president. Most Americans on the Internet
were connecting to it with dial-up modems. Right, so the first stars
and galaxies would have formed 12 years ago,
but seven and a half more years would pass until the earth
formed, about 4.5 years ago. Move a little bit up
to four years ago– that’s when the first
single-celled life formed on Earth. Then leap forward nearly three
and a half more years before the first
multicellular organisms and the Cambrian explosion… What I’m trying to explain is
that all complex life on Earth is a fairly
recent development. Like, on this scale,
the dinosaurs went extinct about three weeks ago–
roughly the last time I changed my Facebook status. Humans and chimpanzees split from their last shared ancestor
about three days ago. The first homo sapiens
emerged 50 minutes ago, roughly the last time
I checked my email. We left Africa 26 minutes ago. The American Indians reached the
Americas six minutes ago– roughly the last time
I check my Twitter. We invented agriculture
five minutes ago, Ancient Egypt three minutes ago,
the Black Death 24 seconds ago, The Industrial Revolution,
six seconds, World War I, two seconds. The Cold War, the first man
on the moon, your birth, the internet, the Big Mac,
all within the last second. But in many other ways,
complex life and humanityareexceptional.>>Thanks, Thought Bubble. Also exceptional, by the way,
the Mongols. Okay, let’s begin at the
beginning– the Big Bang. Hank, wait a second…
whoa, whoa, whoa. I don’t understand how
we know that the Big Bang is really the beginning. Like, what happened
before the Big Bang? Well, okay, theoretical
physicists say that space and time are not
two different things. They are two expressions
of one thing: spacetime. And spacetime was created
by the Big Bang, thus, time didn’t exist
before the Big Bang, so it doesn’t make much sense
to ask what happened before it. There was no “then” then. Of course, this, like many
ideas in cosmology, doesn’t really make any sense
to our puny human brains. It’s largely beyond our
comprehension rather like explaining color
to a blind person. We know that it’s true
because the math works and it explains our
observations so elegantly, but it’s so far outside of how
we directly perceive the world that I don’t think
it’s something even the most genius physicists
are able to imagine. But, yeah, if you’re going
to do a chronological study of the Universe,
the creation of time is probably a pretty good place
to start the story. So the Big Bang wasn’t
something that happened inside the Universe, nor did it
expand into some kind of void. It was literally the moment
when both time and space were created. The thing that was banging
was the Universe itself. It was expanding from an
unimaginably tiny point to an unimaginably large
Universe unimaginably quickly. “Unimaginable” is basically
the subtitle to the story of the Big Bang, but then again,
it’s also kind of the subtitle to everything else
in Big History. I mean, I can only
do this occasionally, but sometimes you look
outside and you’re like, “Oh, my goodness, this is nuts! How did we get trees?” Needless to say, we will be
talking about that. Anyway, the Universe
is a hard worker and it got most of the
heavy lifting done in those first few seconds. For comparison, it takes me
about 20 minutes after I wake up for me
to even get myself into a standing position. But the Universe is
somewhat more efficient. In the barest fraction
of the first second, the Universe inflated from something many, many, many
times smaller than an atom to about the size
of a grapefruit. Like, think of it this way. In much less than
a blink of an eye, if it had originally been
the size of a tennis ball, it would have inflated to over
90 billion light-years across. This inflation theory
has been well backed up by mathematics
for a long time now, but it has recently received
some staggering new support from the BICEP Project
of the South Pole which sadly has nothing
to do with my guns. Ten seconds after the Big Bang,
the Universe had expanded enough that the normal rules
of the Universe with atomic forces and gravity
and electromagnetism that we know and love today
were already in charge. All of the antimatter created
in the Big Bang had combined with matter and
annihilated itself leaving behind only one-billionth of the
matter created in the Big Bang. And that billionth is
everything. And I mean everything–
every grain of sand, every blueberry
you will ever eat, every star that
you will ever see. Everything. We’re already tried to
understand how big a billion is, but just pause
to think about that. Everything–everything–
is one-billionth of the matter created in the Big Bang. (imitates explosion) The First Law of Thermodynamics
is that matter and energy cannot be
created or destroyed. Everything we have now,
we had then. The matter that makes up your
body right now has been around since those moments
13.8 billion years ago. It’s simply changed form. After just three minutes,
the Universe was cool enough that the nuclei of atoms
started forming– just hydrogen and helium back
then, the two simplest elements. Keep those two in mind, however,
because it turns out if you take a bunch of hydrogen
and you wait, like, several billion years, you might
just grow yourself some humans. Let’s remember, at this time, the Universe was still
very, very hot. I don’t want to use the world
“unimaginable” too often. But it was unimaginably hot. The Universe remained, like,
an uber hot sea dominated by radiation, but then
luckily it simmered down to a balmy 5,000
degrees Fahrenheit about 380,000 years
after the Big Bang, allowing matter
and radiation to separate. And remember: I mean, you are a somewhat
firm bag of energy. In my case, I’m not that firm. So anyway, at 5,000
degrees Fahrenheit, radiation was finally able
to move freely through the Universe,
and we see that radiation today as the end of the dark ages
that followed the Big Bang and the beginning of a brilliant
flash that we call: Which is a great
name for a band. Physicists call it “The
fingerprint of the Universe” and it’s one of the most
important pieces of historical evidence
we have for the Big Bang because CBR is everywhere. Tune your radio to a frequency
that doesn’t have a station, a portion of the static
you hear is actually that cosmic background radiation
being picked up by your radio. So you can literally hear the
Universe in its infancy. Sometimes it can be tricky
to know what’s true, especially when we’re
talking about stuff that happened so far
in the distant past. That is why we created science: So just using your limited human
senses, you might come to the same conclusion
as 19th century scientists– that the Universe is static,
eternal, and infinite. Then, using our minds,
if the Universe is infinite– it contains infinite stars
and it has always existed– then the night sky and the
daytime sky for that matter would literally be
filled with stars, so much that day and night
would be indistinguishable. This is clearly not the case,
so something must be amiss. The Universe must either
be not static, not infinite, or not eternal. So which is it? You know how when an ambulance
drives towards you, the sound waves are compressed and the siren sounds
higher pitched, and as it speeds away the waves
are stretched out and the pitch is lower? It’s the Doppler effect. Well, here’s another
name you’ve heard: Edwin Hubble. He realized that light
does the same thing. Galaxies in stars moving away from us have their lights
stretch out, making it more red,
and stars moving toward us have their light compressed,
making it more blue. Combined with the work
of Henrietta Leavitt, which allowed us to accurately
estimate how far away stars are, Hubble was able to
determine that stars on the whole are flying
away from each other. He discovered that the
most remote objects in the sky were all red-shifted
and were actually other galaxies beyond the
Milky Way moving away from us. From here,
he built upon the work of Belgian Catholic priest
Georges Lemaitre who hypothesized
that the Universe began at a single point. Big Bang cosmologists
wanted proof, though. They knew that the amount
of radiation released by the Big Bang would be massive
and they wanted to see it. It wasn’t until the 1960s that
it was found– accidentally– by two guys working
on an antenna at Bell Laboratories
in New Jersey. They were trying to eliminate
all the background noise from an extremely
sensitive radio antenna, but they found this faint hum
coming from every direction. They tried everything
they could to get rid of it, including murdering the pigeons that kept pooping
on the antenna. Kind of sad, but those pigeons,
they gave their lives for one of the most profound
discoveries in modern science. A conversation with a local
radio astronomer led them to show their findings
to an astronomer at Princeton who
confirmed the existence of what had been predicted
for years. The final piece of that Big Bang
puzzle is that we can see it. Light has a speed. When we look at the sun,
we’re seeing the light that left it eight minutes ago. But if we look at something that’s 13.8 billion
light-years away, we’re seeing the stuff that
happened 13.8 billion years ago. That radiation
has been traveling since the very beginning
of the Universe. Not only can we
tell very clearly that there was just nothing
there before that, we can now study that radiation
to learn the sequence of events of the Big Bang. We can also see that the
chemical composition of the early Universe is
what we’d expect to see. A lot of hydrogen,
a lot of helium, and a tiny pinch of lithium. The rest of the period
table had to wait for the fiery furnaces in the
bellies of stars to be created. But more on that next episode. As far as we’ve come
in the past century in crafting a history
of the Universe, there are still many things cosmologists
have yet to discover. For instance,
the Universe behaves as if there’s a bunch
of matter in it that we can’t see or detect. Galaxies’ gravitation is
affected by this matter, but it’s otherwise
completely invisible to us. Physicists call
it “dark matter” but we have no idea what it is. But as in any historical
endeavor, new discoveries will alter
the story in future years, so expect the Big Histories
of ten or 20 years from now to look very different
from today’s. But this isn’t discouraging
because, like, knowing everything
would be boring. There’s a lot left to discover
and at the current pace of scientific inquiry, many
of those amazing discoveries will await us in our lifetime–
or at least in your lifetime. – Whether it be World War II
or the life of Abe Lincoln, all histories ultimately start
with the Big Bang. Yeah, it would be silly to start your typical World War II
textbook with the Big Bang, but it would be about 100
trillion trillion times more ridiculous to say
the Big Bang, the mother of all historical
events, was not history. And that’s why
Big History reaches into the lives of every person
on this tiny speck of dust we call home regardless of
nation, class, or creed, and forms our common story. See you next time.


  • Reply benedictify September 5, 2014 at 1:12 pm

    love this series!

  • Reply Ziggonat September 5, 2014 at 1:25 pm

    Is it just me, or is John out of focus most of the time?

  • Reply Kiên Phùng Chí September 5, 2014 at 1:28 pm

    1:09 Middle finger in VietNam

  • Reply Rickie September 5, 2014 at 1:28 pm

    I think to say "There was nothing before the Big Bang" can be quite ignorant. I don't see there ever being a start or length in existence. I think what's happening today, is eternal. Here's an example. 1. I think there's been 20 Billion Earths like the one we live on. 2. But no, it's eternal, there's no number to comprehend how many times something has happened. Our whole Galaxy has been lived before, and is still being lived similarly somewhere else in existence. Most likely different each time because there's so much inside that it's most likely impossible to even duplicate because of agency.

  • Reply Jahnu Gogoi September 5, 2014 at 1:28 pm

    Bill gates sent me here.

  • Reply thierry hadey September 5, 2014 at 1:38 pm


  • Reply Cheryl Reams September 5, 2014 at 1:41 pm

    very interesting and entertaining 🙂

  • Reply Jep de leon September 5, 2014 at 1:53 pm


  • Reply Vincent Lextrait September 5, 2014 at 1:53 pm

    An excellent video, I love it. We need more of these! A small comment though, it is wrong to claim that a relatively "dark" sky proves obviously that the universe is finite. First because we know since Zeno of Elea (450 BC) and his "Dichotomy Paradox" that a sum of an infinite number of things does not necessarily yield an infinite number, not even a "big number" (, and also because Olber's paradox has a number of other explanations ('_paradox#Alternative_explanations).

  • Reply Chetan Acharya September 5, 2014 at 1:58 pm

    Bill Gates sent me here!

  • Reply Mitche23 September 5, 2014 at 2:15 pm

    The Universe Dies, damn you george R.R. Martin 

  • Reply Elie Miesiac September 5, 2014 at 2:28 pm

    Is Bill Gates a nerdfighter now that he met John?

  • Reply Rigelob September 5, 2014 at 2:50 pm

    WW3 will be fought by the Radiant and the Dire YAY!!!

  • Reply Alvin Holguin September 5, 2014 at 3:04 pm

    cosmos: a spacetime odyssey, hosted by the vlogbrothers.

  • Reply Darwin Angelo September 5, 2014 at 4:08 pm

    For the foolishness of God is wiser than human wisdom, and the weakness of God is stronger than human strength.

  • Reply Mohamed Hanafi September 5, 2014 at 4:42 pm

    Allah (swt) created the universe and whats in between in sixdays

    And also everything is created from water

    Allah (swt) created us to worship him

  • Reply Martin Gimenez September 5, 2014 at 5:38 pm

    I guess when we reach the point of not knowing what the heck happened before the big bang, that's when God enters the picture.

  • Reply Zachary Foster September 5, 2014 at 5:49 pm

    And I have some faith that maybe someone from my generation will get some sort of education thanks to this simplified explanation

  • Reply Shaina Joseph September 5, 2014 at 7:23 pm

    I'm not sure I've ever heard John speak so slowly. 

  • Reply Patrik Korda September 5, 2014 at 7:54 pm

    This is amazing. I literally jizzed, metaphorically speaking.

  • Reply Jeramiaha Walker September 5, 2014 at 8:02 pm

    (This is simply food for thought, no need for someone to start a crusade on my comment lol)
    Sometimes I wonder in all of our research and mathematical equations that we create to represent everything. How can we even be sure we are right? I mean seriously?

    5:15–6:00 I realized this. I mean, how do we not know we are over thinking it and convincing ourselves it is fact simply because "The numbers add up." when the numbers were made up in the first place?

    I think it is fair to say that Scientist are FARRR TOOO analytical lol, but just because it is based off of logic doesn't necessarily make it correct.

  • Reply archana811 September 5, 2014 at 9:40 pm

    Could big bang be the start of a recycling process which is experimenting on simple things with loads of permutations and combinations, to generate something new and complex. Could the process be like a journey with a definitive start and end ,but with never ending creations and destructions within itself, to generate a better formula/code to carry forward to improvise, multiply (maybe) ,and evolve all over again with the next big bang..??

  • Reply Jakobsen September 5, 2014 at 10:40 pm

    So, we are all 13.8 billion years old :O

  • Reply Alissa Frederick September 5, 2014 at 11:17 pm

    I love this.

  • Reply Val Aero September 6, 2014 at 12:54 am

    I find this to be rather satirical. You notice they said in "theory" the universe was created x billions of years ago. What cant be proven is not actually factual.

  • Reply Anas Debdi September 6, 2014 at 1:19 am

    Shiiiit. Science is awesome. Thanks Bill Gates for the video and thanks John Green for explaining it in an AMAZING way.

  • Reply Michael Benzur September 6, 2014 at 3:16 am

    this is by far the best representation of this information. amazing work john and hank.

  • Reply SunTzu September 6, 2014 at 3:19 am

    Amazing videos! I wish I had these as a child :/

  • Reply Constantin Dancu September 6, 2014 at 3:33 am

    You had me at: the Universe was Created. And yes, time did not exist before that, time and space are one timespace. However, there is no atempt (for obvious reasons) to explain why and how did the first atom (or whatever you guys say it was) expanded like that. If space and time did not exist before the Big Bang, they were created then and there, by the big bang, right (but wait, then and there means time and space). Moreover dating the Big Bang 13.8 billion years ago, it means that it had a specific moment (and location?) where it started. If this is not proof of God, than I don't know what is. 

    p.s. – the odds of forming intellect from an explosion, in the universe are 0. If you try to tell me about alternate universes, I tell you to give me the slightest proof for it before we talk about that (which is impossible – scientifically speaking).

  • Reply Ninjastripy September 6, 2014 at 3:33 am

    French the llama how did I not know this existed interrobang?! 

  • Reply Charlie Rivadeneira September 6, 2014 at 3:36 am

    Thanks for wearing a Ecuador's jersey. You are awsome.

  • Reply arsymizz33 September 6, 2014 at 3:46 am

    Political instability in Nepal. 2:57

  • Reply amrX September 6, 2014 at 7:58 am

    Bill Gates send me here!

  • Reply Napok September 6, 2014 at 9:11 am

    " Because it turns out, if you take a bunch of hydrogen and you wait like several billion years you might just grow yourself some HUMANS."  (with no brains)

  • Reply Steel Yuan September 6, 2014 at 3:15 pm


  • Reply Carlos Escobar September 6, 2014 at 7:37 pm

    Comentaré en español para que nadie me entienda.

  • Reply Mark Susskind September 6, 2014 at 8:32 pm

    The Universe is Banging!

  • Reply Paola September 6, 2014 at 8:40 pm

    omgsh!! I love you vlog bros..thank you for making this awesome vids. 

  • Reply Kian Williams September 6, 2014 at 11:52 pm

    So about the idea that the night sky should be all lit up and such if the universe is infinite… could someone explain this to me? Like isn't it possible that there is dark matter or some "foggy stuff" or behavior of light that causes us to simply not be able to see that far and therefore there is black in between the stars? Sorry about the nooby question but could someone explain why that isn't possible? Thanks!

  • Reply Andres Cepeda September 7, 2014 at 4:40 am

    i was having a good time before that nosy whiny SJW asshole that is hank green

  • Reply Badry September 7, 2014 at 11:02 am

    Please add transcript to this video and all the others! thank you

  • Reply Shael Marino September 7, 2014 at 11:16 am

    Science and History are brothers, luckily so are Hank and John 

  • Reply Grigor Yosifov September 7, 2014 at 11:56 am

    If we consider the Big Bang was in no space and no time and space and time started exiting after it happened then how can we tell that it expands, I mean compared to what it is expanding when we have no room in which it resides?

  • Reply Wessel September 7, 2014 at 2:26 pm

    This is amazing.

  • Reply Rachel Lee Chai Ling September 7, 2014 at 2:50 pm

    Poor pigeon yet funny… 🙂

  • Reply nadiact1000 September 7, 2014 at 4:20 pm

    Yes, yes, yes, yes, yes! This is awesome! I just sat here grinning the whole time. Was not expecting this. (I was so confused when John started History II; I thought that was Big History.)

  • Reply nadiact1000 September 7, 2014 at 4:21 pm

    You guys should let Nerdfighters know about this new series, since it's not part of the regular CC channel.
     Apparently this has been up for two weeks, and I had no idea!

  • Reply Apoorv Vishnoi September 7, 2014 at 6:20 pm

    you focused more upon big history rather than big bang, u told about space and time or spacetime but you did not tell people how they relate or what even Einstein said  on this, moreover when no one knows how it started than how come you are doing something different in almost 14 minutes ! you are publishing something that is improper and in-appropriate and that doesn't even makes me feel oh man look they revealed the big secret i did not knew things moving apart when it is already said universe is expanding ! i guess most of us read about nature about particles in gaseous form what happens when a balloon is compressed and expanded this is all we found in our surroundings in next episode bring some facts that are unknown and don't stretch it like i did to my writing !!!

  • Reply Terrazine September 7, 2014 at 8:16 pm

    6:10  "The moment when both time and space were created"

    How did this happen?
    What happened at t=0?

  • Reply Tucker Wilke September 7, 2014 at 9:03 pm

    If the universe started out as something much smaller than an atom, how is it infinate now? How can it go from finite to infinite?

  • Reply All the strings September 8, 2014 at 12:31 am

    When you say that the universe expanded to the size of a grapefruit, are you referring to the observable universe, or the actual infinite unseeable universe? 

  • Reply Grace Wong September 9, 2014 at 4:54 am

    8:11 This machine kills fascists

  • Reply Sophie B September 9, 2014 at 9:32 am

    Currently doing Big History at school, such an awesome project! John and Hank are also my favourite youtubers of all time, and I'm definitely using this for revision

  • Reply Joe Bannon September 9, 2014 at 1:26 pm

    Time is a man made invention.

  • Reply WhiteBoyShakingNOLABOUNCE September 11, 2014 at 7:53 pm

    I have been looking for these VIDEOS FOR AGES!!!!

  • Reply Drew Rash September 12, 2014 at 1:55 pm

    What if our "the big bang" was the exhaust of a giant gravity well of another universe creating a universe that we are in and we simply can't see the light from beyond the event horizon wherever it may currently be.
    Stuck in an oscillating pair of balloons of gravity emptying back and forth into each other switching every x finite years once the balloon with larger pressure lowers enough or to nothing where it then get's sucked back in the other way.

  • Reply Drew Rash September 12, 2014 at 2:05 pm

    Feel like I'm rewatching the cosmos (recently redone) but a much shorter version and a little different interpretation.

  • Reply Margie Andrews September 16, 2014 at 2:44 pm

    How do you have time for all this?? You put me to shame…….

  • Reply Shangori September 16, 2014 at 3:46 pm

    What's really silly is the idea of world war 2 in light of that massive amount of time. Really, how can anyone be bothered trying to kill another human being, wanting to take over crimea or think that you should spread your religion for god, when we are ultimately so very very tiny compared to everything else. 

    I wish humanity could finally see that we should just be happy to be alive and 'current', able to see the things we see, to explore what we can and to further our knowledge and wellbeing for everyone. 

    What's life if you cannot enjoy it? 

  • Reply Hector Peabody September 17, 2014 at 11:29 pm

    It is absurd to ascribe a creative force, particularly one with a human-like personality, to the existence of the Universe. Such an endeavor is clearly the product of ego, wishful thinking, and working backwards from a desired conclusion.

    However, it is also patently absurd to talk about "the moment when time came into being."

  • Reply Nathan Fei September 18, 2014 at 1:19 am

    Scary camera defocusing

  • Reply Julika7 September 18, 2014 at 9:29 pm

    Wow. This video existed before it was posted on Crash Course? 😮

  • Reply aaabbbcization September 19, 2014 at 5:02 pm

    Maybe it was created by heaven. I have found 2 real genie lamps.

  • Reply Ebraheem Jabaar September 19, 2014 at 8:50 pm

    "And it is We who have built the universe with [Our creative] power; and, verily, it is We who are steadily expanding it."[51:47]

    "Have not those who disbelieve known that the heavens and the earth were joined together as one united piece, then We parted them? And We have made from water every living thing. Will they not then believe?? "[21:30]

  • Reply David Carr September 20, 2014 at 12:59 am

    Legitimate sciencey question. I just learned about this ( ) And it makes me want to ask "what effect does the suns orbit around the galactic core have on big history?" Like, if the sun goes around the galaxy every 226 million years, flips it's period every 26000 years, and rotates 360 degrees on its own axis every 22 years, Do we see any Big History correlations? not just for stars, comets, and constellations, but like, in human terms. Does this correlate with any historical record of rising and falling civilizations, or more appropriately, mass extinctions and other such previously unexplained phenomena? Help my Nerdfighteria, You're my only hope.

  • Reply Allan Herrera September 25, 2014 at 3:24 am

    I want proves that The Big Bang Theory did happened.
    As there still proves that God exists.
    How to prove it?
    Easy, the first thing ; look around you(nature) do you think those beautiful lands,animals(us),trees,etc. were created by an explotion of an atom?
    Answer is No.
    2nd. After you think about it,Believe!
    3rd. Neal and then pray. From the bottom of your hart,talk to our AMAZING GOD.
    4th. Keep on Believing!
    And after that you will see the answers from God .
    He Loves You!
    He will forget what you have done bad.
    He is the BEST feeling you will never have.
    He Will Bless your life.

  • Reply Anne-Marie Hendry September 25, 2014 at 1:28 pm

    You left God out of this entirely. How very sad!

  • Reply Burhan Çam September 25, 2014 at 10:18 pm

    they wants to say…
    anyway live your life the big bang isnt interesting you 

  • Reply xXrandom September 30, 2014 at 4:41 pm

    I think it's sad that both elemtary and secondary school tried to brainwash me with this garbage.

  • Reply djtigerm October 2, 2014 at 5:31 am

    Excellent Job Crash Course and Stay Super! =) Came here from the Twitter of Bill Gates! ^_^
    Fabulous sir John Green and Hank Green ! =) Stay Awesome! =D
    -BAM! P.E.F. – WAM! DJ, TIGER M! ^_~*

  • Reply hadricalifornia October 5, 2014 at 9:04 pm

    Thank you, thank you. This is incredible. John AND Hank in a touching, funny, state of the art and crystal clear history of everything. This made me feel less mortal.

    We need MORE OF THIS. You've got my money through Subbable.

  • Reply Pang Christian October 15, 2014 at 11:41 am

    fvck all this time i think john green and hank green is the same guy , shit i couldn't even distinguish it

  • Reply Ethan W Monster October 28, 2014 at 9:29 pm

    i love how all these religious dumb farts think that the big bank is fake because it is just a theory do any of you dumb farts know what a theory even is?

  • Reply Coryn02 October 30, 2014 at 1:53 am

    I've waited for something like this forever. Hooray!

    … WHAT?! Future wars of Radiant and Dire! Hell yes! I'd love to be Earthshaker or something.

    Hope I'm not a creep though…

  • Reply hubris November 11, 2014 at 4:15 pm


  • Reply Chickknight Greenleaf November 15, 2014 at 5:02 am

    bloody hell! after rewatch this i can't wait for Jame Webb space telescope to lauch!

  • Reply ConservativeAnthem November 16, 2014 at 12:59 pm

    Why do all of these "science" videos have to be written like Sesame Street segments, with dumb jokes, dumbed down "science" and awful actors? Uggh…

  • Reply Spaceman Unknown December 8, 2014 at 11:20 pm


  • Reply Ron Sydney December 13, 2014 at 2:05 pm

    Everything you've said about the Big Bang takes…..well….takes Faith to believe in it…no proof 

  • Reply George Gray December 14, 2014 at 8:11 am

    I don't like these Crash Course videos – the guy speaks far too fast, doesn't pause, has a monotone, and doesn't use much intonation. All that makes it difficult to decipher what he's saying.

  • Reply Jacob Rideout January 29, 2015 at 5:38 pm

    Is the universe alive because it can die? And stars are small organs and stars cells.

  • Reply Jacob Rideout January 29, 2015 at 5:47 pm

    My mind is blown, we can't even comprehend the reality of it all. Literally everything in your life doesn't matter, you don't matter. Think of when someone lives and dies it seemed like a long time to them but its over for us. There dead even though in the TIME they existed seemed long it's over. Whatever was here before spacetime is the norm. When spacetime is created its over in the same time taken to create it. That's why it doesn't matter how long you live the universe is over.

  • Reply Jacob Rideout January 29, 2015 at 5:49 pm

    Darkmatter is what was here before spacetime, as the universe disapates it's obsorbed back into dark matter.

  • Reply Siddharth Jindal February 22, 2015 at 2:04 pm

    i have a little doubt if someone may?
    when we look for alien life on other planets… why do we narrow possibilities down by considering presence of water/oxygen? why can't life be possible if its not the earth's way of biology?

  • Reply Charls Wildwind May 21, 2015 at 10:49 pm

    had a chem final, was watching your bros videos before hand. glad to see your on this one :3

  • Reply Charls Wildwind May 21, 2015 at 10:57 pm


  • Reply Guilherme Moresco February 24, 2016 at 11:14 pm

    Ahhh yeah Greens!

  • Reply Glenn Goryl February 28, 2016 at 6:28 pm

    For me, the question is not "when was the moment when time & space we created," but "where does time & space exist?"

  • Reply Shannon King May 9, 2016 at 9:51 pm

    It all started with a big bang!

  • Reply Shannon King May 9, 2016 at 9:51 pm

    It all started with a big bang!

  • Reply Peter Kish July 30, 2016 at 10:54 pm

    Why does his laptop say THIS MACHINE KILLS FASCISTS?

  • Reply kittykatkool August 23, 2016 at 1:09 pm

    How did people think when language wasn't invented?

  • Reply Chris Beath December 21, 2016 at 12:30 am

    Crash Course is a youtube channel and has posted this video themselves. Big History Project is stealing it.

  • Reply Mavid Dedina March 5, 2017 at 8:48 pm

    u 2 look nothing alike.

  • Reply cilinders March 8, 2017 at 1:34 am


  • Reply Santiago Galindo June 24, 2017 at 3:45 am

    I love this video!

    I wish the content could be delivered as an animated serie of 3 parts for kids.

  • Reply blobey1965 July 11, 2018 at 5:27 am

    The intro guys in the first three minutes are so annoying, I cannot watch any further, in spite of the recommendations. Jeeze Yeech!

  • Reply ThisAndThat From TwiMit February 16, 2019 at 2:08 am

    I can't understand the purpose of this video and who is the intended audience from the way the whole thing has been treated and presented! After watching the videos, only thing I can say is, Wow! That was great!" But, did I learn anything (other than a set of facts and information), did I get a chance to reflect while watching it, do I remember anything, except the whole history and everything in it is incredible and unimaginable?? I have to say I learned very little… if I had to tell the story to someone else, I would hardly be able to do so! The whole presentation and pace of his narration, his mannerisms, cues in the presentation seem to be geared towards someone, who apparently must be dumb, uninterested, not very curious to know things – to make that kind of audience get interested. However, the words and terminologies used are hard core scientific and technical terms that need prior education – deep education – to understand. So who is it for? Who is going to be benefited? I don't have a clue. I'm very curious, I have been looking for good material on history that would bring some sense of logic in to why the things are as they are, that would potentially raise new thoughts in me… but, these videos do little for me! I doubt, if they actually get people interested who are not interested in learning anything to begin with. The only person who seems to be interested and awed by his own rapid speech on scripted material with funny (??) gestures is the narrator himself! Sorry, I wish big history had done it differently and treated the material with the seriousness it deserves…. After much anticipation, it has turned out to be a disappointment. Sorry 🙁

  • Reply Bella Reilly March 13, 2019 at 5:42 pm

    7:22 the bicep project which sadly has nothing to do with my guns
    “WHAT GUNS MY DUDE!!!” 😂 😂 😂

  • Reply Luigi Pati July 1, 2019 at 3:32 pm

    let's also not forget that not only we all come from the same place, but we all also end up in the same one, whatever that is/nothingness.

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