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

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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.

Crash Course Astronomy Poster:

Table of Contents
Distant Galaxies Show a Red Shift in Their Spectra 2:07
The Universe is Expanding 2:51
This Model is Called “The Big Bang” 5:12
The Universe is Almost 14 Billion Years Old 11:43

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PHOTOS/VIDEOS
Hubble Goes to the eXtreme to Assemble Farthest-Ever View of the Universe [credit: NASA; ESA; G. Illingworth, D. Magee, and P. Oesch, University of California, Santa Cruz; R. Bouwens, Leiden University; and the HUDF09 Team]
Out of this whirl: The Whirlpool Galaxy (M51) and companion galaxy [credit: NASA, ESA, S. Beckwith (STScI), and The Hubble Heritage Team STScI/AURA)]
Red-Shifts in the Spectra of Extra-glactic Nebuale [credit: American Astronomical Society, NASA Astrophysics Data System]
Andromeda [credit: Bill Schoening, Vanessa Harvey/REU program/NOAO/AURA/NSF]
The Big Bang (video) [credit: NASA]
The Sun [credit: NASA/SDO]
Alpha Centauri [credit: ESO/Digitized Sky Survey 2, Acknowledgement: Davide De Martin]
Andromeda [credit: NASA/JPL-Caltech]
Friedmann Universes
Friedmann Equation
Penzias and Wilson stand at the 15 meter Holmdel Horn Antenna that brought their most notable discovery. [credit: NASA]
Planck CMB [credit: ESA and the Planck Collaboration]
Galaxy Superclusters [credit: Marenostrum Numerical Cosmology Project]

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