Lecture 22: The Big Bang, Nucleosynthesis, and the Formation of Structure

If the universe is expanding, it had to be smaller in the past.

What are the implications of this logic?

The Big Bang Model (movie)

To read more about tests of Big Bang theory, click here.


If the Universe was this perfectly glowing ball of hot plasma, how does the structure we see today arise?

Starts like this...

and ends like this...

Can tiny fluctuations in the microwave background grow into galaxies and more? Use simulations (movie) and compare results of different models...