Homework #4:

Due Tuesday, Nov 8th in class

1) Calculate the velocity difference that the Hubble Expansion imparts between one side of the Earth to the other side. Why is the Earth not being ripped apart?

2) Same as 1, but do the calculation for the edges of the Milky Way galaxy. Now, do the same for the effect between the Milky Way Galaxy and the Coma Cluster of Galaxies.

3) Explain what would happen in a universe, including formation of structure and the Milky Way, that had more dark energy than the one we live in. Explain what would happen if we had less dark energy that what we have.