A Brief History of the Universe: Crash Course Astronomy #44

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Thanks to the wonders of physics, astronomers can map a timeline of the universe’s history. Today, Phil’s going to give you an overview of those first few minutes (yes, MINUTES) of the universe’s life. It started with a Big Bang, when the Universe was incredibly dense and hot. It expanded and cooled, going through multiple stages where different kinds of matter could form. It underwent a phenomenally rapid expansion called inflation, which smoothed out much of the lumpiness in the matter. Normal matter formed atoms between 3 and 20 minutes after the bang, and the lumps left over from inflation formed the galaxies and larger structures we see today.

Crash Course Astronomy Poster: http://store.dftba.com/products/crashcourse-astronomy-poster

Table of Contents
Mapping the History of the Universe Using Math and Observations 00:41
It Started With A Bang! 1:58
Rapid Expansion Smoothed Out Matter 4:55
Normal Matter Formed After 3-20 Minutes 5:12

PBS Digital Studios: http://youtube.com/pbsdigitalstudios

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Proton Collision Event with Boosters and LHC https://www.youtube.com/watch?v=NhXMXiXOWAA [credit: ATLAS]
Melting Snowball video courtesy of Phil Plait
Big Bang to Hubble http://www.spacetelescope.org/videos/hst15_big_bang_to_hubble/ [credit: ESA/Hubble (M. Kornmesser & L. L. Christensen)]
Journey to the centre of the Sun http://www.spacetelescope.org/videos/astro_ac/ [credit: ESA/Hubble (M. Kornmesser & L. L. Christensen)]
PIA16873: Best Map Ever of the Universe http://photojournal.jpl.nasa.gov/catalog/PIA16873 [credit: ESA and the Planck Collaboration]
A high resolution foreground cleaned CMB map from WMAP http://space.mit.edu/home/tegmark/mapforegs.pdf [credit: Tegmark et al.]
Planck comb rbcol scaled http://www.astro.cardiff.ac.uk/~spxcen/CMB_Sims/Planck_comb_rbcol_scaled.png [credit: Chris North, Cardiff University]
WMAP’s Portrait of the Early Universe http://svs.gsfc.nasa.gov/cgi-bin/details.cgi?aid=10123 [credit: NASA]


Lulu, Drinker of Coffee says:

How can people dogmatically disregard the scientific process? It's so much more beautiful and elegant than any faith system.

Ruuki Aimia says:

What are your thoughts on the theory that we are living inside a black hole? I mean… isn't the "Heat death of the universe" theory that we will supposedly go through consistent with Hawking radiation? 😮

s rajendran says:

can you explain general relativity

Sammy Sam says:

I love this.

OneHitGamer Studios says:

Im new to crash course but i must say, to host guy….i like you. Some hosts suck…but your way of speaking works. good job.

HEJ _19 says:

So who started the whole universe?

John Kitto IV says:

So what about a retrospective over the history of human space exploration?
An episode dedicated to outlining the events in mankind's mission to explore outer space?

Claire Griff says:

What was there before the Big Bang?

satansaysimnuts says:

Everything that we know of with matter, time the universe is a mere by product of the initial reaction.
The production of space.

Ben Thomason says:

Isn't this stuff common knowledge?

Debedeb Wilson says:

the universe can grow just as anything living. but the idea of life in science is restricted

Debedeb Wilson says:

big bang never happen

Autumn Rockwood says:

but like where did the stuff that started the big bang come from? these are the questions that keep me up at night

Dior Dedushi says:

Since the Universe first began 13.7 billion years ago, then what happened 15 billion years ago? What was in our spot? I understand maybe nothing was there but if nothing was there than how did the atoms form from no base? Since there is no protons or electrons at 15 billion years ago Atoms could not have just appeared there! There must have been something 15 billion years ago? So back to my question… through your knowledge Crash Course, what do you guys believe was there lets say 15 billion years ago, and how would atoms form from nothing back than?

EvansEverythingChannel EBG says:

When the Big Bang came it was 10 times 32 kelvin the hotest ever!!

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