The Big Bang, Cosmology part 1: Crash Course Astronomy #42

Thanks to observations of galaxy redshifts, we can tell that the universe is EXPANDING! Knowing that the universe is expanding and how quickly it's expanding also allows us to run the clock backward 14 billion years to the way the universe began - with a bang.

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Chapters:
Introduction: The Origins of the Universe 00:00
Distant Galaxies Show a Redshift in Their Spectra 2:07
The Universe is Expanding 4:13
The Big Bang 5:12
Lookback Time 6:06
The Cosmic Microwave Background 7:50
What is the Universe Expanding Into? 9:17
Review 12:12

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PHOTOS/VIDEOS

[ryner]

I am the center of my observable universe.

[elvfrem]

I love that Episode 42 is, infact, the meaning of life.. The Universe.. Everything.

[ivanchagasp]

So it explains why I keep getting fatter and fatter. I'm just expanding. Thank you, Crash Course!

[leodrps]

My astronomy professor used to explain the expansion of space this way: imagine you're baking a blueberry muffin. When you add the batter with the blueberries in the cupcake liners, the blueberries are in certain places. After baking, because the batter has cooked and expanded, the blueberries have also moved with it, but only because the batter took them along for the ride.

[nacho]

The thing that I love most about crash course hosts is that they are all passionate about the subject they are imparting knowledge on. They have the twinkle in their eyes and the spark in their words telling us how awesome all of *this* is.

[aperson]

We'll have to throw a big party when the universe turns 14 billion.

[rrozinak]

In the beginning the Universe was created.
This has made a lot of people very angry and been widely regarded as a bad move.

[daniel]

Holy shit, a poke at religion at the beginning and then the Flying Spaghetti Monster like a minute in. Phil just became my new idol

[Lornext]

Only three times older than the earth doesn't really sound that old when you think about it.

[Clever_Catchphrase]

"What else would we call the Big Bang?" Well, in the words of Calvin from Calvin and Hobbes, I believe "The Horrendous Space Kablooie" would fit well.

[doublequilI]

This series is a great review and comprehension source for taking astronomy 101-102. Thanks, guys. (Got an A.)

[chrissycannon]

Hi, I love how you explain how science is fluid and sometimes you have to break the entire framework. It supports the growth mindset for students. Thank you for sharing these wonderful videos.

[london-living]

From a novice point of view these lessons are amazing even though they can start to get confusing as I go along.once complete I will start from the beginning again

[jennifer]

I love these crash courses. I have been using them to get my husband up to speed. He used to think the Big Bang was how the dinosaurs died. Now our dates consist of stargazing through or telescopes. The structure of crash courses allow me to show him one thing at a time. We love it

[StevenEveral]

0:11 I'm more surprised that there were perfectly cut wedges of cheese back in neanderthal days.

[Nauta]

Praise the Sun, they included the Great Spaghetti Monster!

[DragoniteSpam]

> Episode 42, The Big Bang

You guys did that on purpose.

[TheOicyu]

1:32 - Thanks for giving the FSM a cameo in the video. I also would have accepted Russell's Teapot or the Invisible Pink Unicorn as substitutes.

[cmradePR]

Thinking about what was anything before the Big Bang and what will happen in the future breaks my mind.

Was there anything before the Big Bang?
Was there another universe with different laws of physics?

Will our universe just end?
Is it like a giant heart that is pulsating and we're just in the expanding portion?
Will the universe contract and recreate the Big Bang?

It's too much for me to fathom.

But these questions are what make me feel alive. And glad to live in the universe we live in today.

Thank you, for another great video!

[PennyDreadful]

2:14 Vesto Slipher sounds like the name of a bounty hunter from a galaxy far far away. How is that a real name?