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Lecture13

# Lecture13 - Big Bang Black Holes No Math Dr Jonathan Asaadi...

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Big Bang, Black Holes, No Math Dr. Jonathan Asaadi Dr. Jonathan Asaadi Evidence for the Big Bang Evidence for the Big Bang Part 2 Part 2 Big Bang, Black Holes No Math Topic: Evidence for the Big Bang 1

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In Class Quiz 10 (Part 1/2) Which best describes the motion of these galaxies? a)Both are moving towards us, but the left one is moving faster than the one on the right b)Both are moving towards us, but the right one is moving faster than the one on the left c)Both are moving away from us, but the left one is moving faster than the one on the right d)Both are moving away from us, but the right one is moving faster than the one on the left Big Bang, Black Holes No Math Topic: Evidence for the Big Bang 2 Reference spectrum
Shifted to toward the “ red ” end of the spectrum (longer wavelength) so it is moving away from us Shifted to toward the “ red ” end of the spectrum (longer wavelength) so it is moving away from us This one has a greater shift (meaning the dark lines have moved further) so it is moving faster

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In Class Quiz 10 (Part 1/2) Reference brightness Which of these two stars is further away from us based on their brightness? Star # 1 Star # 2 Big Bang, Black Holes No Math Topic: Evidence for the Big Bang 4 (A) Star #1 is further away from us (B) Star # 2 is further away from us (C) Both stars are the same distance from us Star # 2 is dimmer and Star # 2 is dimmer and thus is further away thus is further away
Subject Outline The Exploding Universe Start to wrestle with the data and attempt to understand Expanding Space-Time Put forward the best hypothesis we've found Photons and Hydrogen in the Universe Tell the story again, from the beginning Big Bang, Black Holes No Math Topic: Evidence for the Big Bang 5

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Evidence for the Big Bang The universe is expanding Observe galaxies moving away from us in all directions (Hubble's observation) Cosmic Microwave Background Observe uniform distribution of photons coming from all directions Abundance of Hydrogen and Helium Most of the universe is basically only light elements and very little else (Three, of literally hundreds, of pieces of evidence that point to the Big Bang hypothesis)
7 Overview: Evidence for the Big Bang 1) We observe all distant galaxies to be moving away from us The further away the galaxy is, the faster it is moving away from us This implies that things were closer together yesterday then they are today... True no matter which direction we look Universe appears isotropic and homogeneous Implies thermal equilibrium in the early universe Natural consequence of expanding spacetime Consistent with the theory of General Relativity Big Bang, Black Holes No Math Topic: Evidence for the Big Bang 7

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2) Observe low energy photons uniformly distributed in all directions with a temperature of about 2.7 degrees above absolute zero (Kelvin) - Call this the Cosmic Microwave Background (CMB) - “Smoking gun” evidence that the universe was in a hot, dense state sometime in the past
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• Spring '14
• Dr.JonathanAsaadi
• General Relativity, Big Bang, Redshift, Cosmic microwave background radiation

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