Watch this video on the origins of the Big Bang theory
The mathematical expression of the Hubble-LeMaitre law is very simple : v = H₀ × d
Where:
v is the how fast the galaxy is moving away
d is the proper distance to the galaxy
H₀ is the Hubble constant (or Hubble parameter)
the v is measured by
Hubble's constant refers to
The prevailing theory of physicists before Lemaitre believed that
The video didn't explain cosmic microwave background but did mention it as
Einstein's theory of a static universe had a problem - gravity should be pulling the entire universe together. He solved this with
Watch the video on the theory of the Big Bang
Do you have any questions?
Another useful analogy to the expanding universe is a large cake with raisins in it (with no force to pull the raisins to the bottom of the pan. The raisins start close together, but as the cake rises, the cake pushes the raisins apart, but the raisins themselves don't expand. In this analogy space is
Another useful analogy to the expanding universe is a large cake with raisins in it (with no force to pull the raisins to the bottom of the pan. The raisins start close together, but as the cake rises, the cake pushes the raisins apart, but the raisins themselves don't expand. In this analogy galaxies are
The video mentions a concept of an endless cycle of collapse and expansion at the end. The theory of this is that the energy that promoted the expansion must come from somewhere, and when it is expended, gravity will take over and pull everything back together. The evidence for this was that the initial expansion, called cosmic inflation was extremely fast, much much faster than the expansion today. later that expansion decelerated a lot. This theory relies on the idea that space expansion is currently
Read chapter 17.1 in your book
Define the cosmic horizon
explain Olber's Paradox
Cosmic microwave background was predicted before it was detected. What was the theory that predicted it, and what exactly did they expect to see?
What are the major differences between the big-bang theory and the steady-state theory?
write a question about the evidence for the big bang that you would like to discuss in class.
ok, where are you now
the difference between stuff in the universe moving away from each other and the space itself expanding
what is the cosmic microwave background
if the earth is not at the center of the expansion, why is everything moving away from us at a constant rate
what is the cosmic horizon
how can things beyond the cosmic horizon be moving away from the earth at more than the speed of light?
I've got this
I'm fuzzy
So confused