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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 its expanding also allows us to run the clock backwards 14 billion years to the way the universe began - with a bang.
Season 1 Episode 42 Length 13:09 Premiere: 12/10/15

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Clips & Previews

Season 1 Episodes

Life in the Universe: Crash Course Astronomy #46
S1 E46 Length 11:09 Premiere Date 01/21/16

Deep Time: Crash Course Astronomy #45
S1 E45 Length 15:00 Premiere Date 01/14/16

A Brief History of the Universe: Crash Course Astronomy #44
S1 E44 Length 12:21 Premiere Date 01/07/16

Dark Energy, Cosmology part 2: Crash Course Astronomy #43
S1 E43 Length 11:08 Premiere Date 12/17/15

The Big Bang, Cosmology part 1: Crash Course Astronomy #42
S1 E42 Length 13:09 Premiere Date 12/10/15

Dark Matter: Crash Course Astronomy #41
S1 E41 Length 11:45 Premiere Date 12/03/15

Gamma-Ray Bursts: Crash Course Astronomy #40
S1 E40 Length 13:51 Premiere Date 11/12/15

Galaxies, part 2: Crash Course Astronomy #39
S1 E39 Length 15:20 Premiere Date 11/05/15

Galaxies, part 1: Crash Course Astronomy #38
S1 E38 Length 11:51 Premiere Date 10/29/15

The Milky Way: Crash Course Astronomy #37
S1 E37 Length 10:59 Premiere Date 10/22/15

Nebulae: Crash Course Astronomy #36
S1 E36 Length 12:01 Premiere Date 10/15/15

Star Clusters: Crash Course Astronomy #35
S1 E35 Length 10:21 Premiere Date 10/08/15

Binary and Multiple Stars: Crash Course Astronomy #34
S1 E34 Length 11:46 Premiere Date 10/01/15

Black Holes: Crash Course Astronomy #33
S1 E33 Length 12:11 Premiere Date 09/25/15

Neutron Stars: Crash Course Astronomy #32
S1 E32 Length 12:42 Premiere Date 09/17/15

High Mass Stars: Crash Course Astronomy #31
S1 E31 Length 12:02 Premiere Date 09/10/15

White Dwarfs & Planetary Nebulae: Crash Course Astronomy #30
S1 E30 Length 11:09 Premiere Date 08/27/15

Low Mass Stars: Crash Course Astronomy #29
S1 E29 Length 12:02 Premiere Date 08/20/15

Brown Dwarfs: Crash Course Astronomy #28
S1 E28 Length 11:05 Premiere Date 08/13/15

Exoplanets: Crash Course Astronomy #27
S1 E27 Length 11:49 Premiere Date 08/06/15

Stars: Crash Course Astronomy #26
S1 E26 Length 10:40 Premiere Date 07/23/15

Distances: Crash Course Astronomy #25
S1 E25 Length 11:20 Premiere Date 07/16/15

Light: Crash Course Astronomy #24
S1 E24 Length 10:33 Premiere Date 07/09/15

Meteors: Crash Course Astronomy #23
S1 E23 Length 11:21 Premiere Date 07/02/15

The Oort Cloud: Crash Course Astronomy #22
S1 E22 Length 11:40 Premiere Date 06/25/15

Comets: Crash Course Astronomy #21
S1 E21 Length 11:54 Premiere Date 06/18/15

Asteroids: Crash Course Astronomy #20
S1 E20 Length 11:32 Premiere Date 06/04/15

Uranus & Neptune: Crash Course Astronomy #19
S1 E19 Length 12:15 Premiere Date 05/28/15

Saturn: Crash Course Astronomy #18
S1 E18 Length 12:12 Premiere Date 05/21/15

Jupiter's Moons: Crash Course Astronomy #17
S1 E17 Length 10:26 Premiere Date 05/14/15

Jupiter: Crash Course Astronomy #16
S1 E16 Length 10:42 Premiere Date 05/08/15

Mars: Crash Course Astronomy #15
S1 E15 Length 10:11 Premiere Date 04/30/15

Venus: Crash Course Astronomy #14
S1 E14 Length 10:46 Premiere Date 04/24/15

Mercury: Crash Course Astronomy #13
S1 E13 Length 10:17 Premiere Date 04/16/15

The Moon: Crash Course Astronomy #12
S1 E12 Length 09:47 Premiere Date 04/09/15

The Earth: Crash Course Astronomy #11
S1 E11 Length 10:13 Premiere Date 04/02/15

The Sun: Crash Course Astronomy #10
S1 E10 Length 11:44 Premiere Date 03/19/15

Introduction to the Solar System: Crash Course Astronomy #9
S1 E9 Length 09:57 Premiere Date 03/12/15

Tides: Crash Course Astronomy #8
S1 E8 Length 09:46 Premiere Date 03/05/15

The Gravity of the Situation: Crash Course Astronomy #7
S1 E7 Length 09:41 Premiere Date 02/26/15

Telescopes: Crash Course Astronomy #6
S1 E6 Length 11:59 Premiere Date 02/19/15

Eclipses: Crash Course Astronomy #5
S1 E5 Length 10:10 Premiere Date 02/13/15

Moon Phases: Crash Course Astronomy #4
S1 E4 Length 09:45 Premiere Date 02/05/15

Cycles in the Sky: Crash Course Astronomy #3
S1 E3 Length 09:28 Premiere Date 01/29/15

Naked Eye Observations: Crash Course Astronomy #2
S1 E2 Length 11:16 Premiere Date 01/22/15

Introduction to Astronomy: Crash Course Astronomy #1
S1 E1 Length 12:11 Premiere Date 01/15/15

The Moon: Crash Course Astronomy #12
Clip Length 04:41 Premiere Date 07/01/19

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