1. Introduction of the idea of “dark energy” is designed to explain the fact that it appears the expansion rate of the universe is doing what?
2. What is the central idea of universal expansion? Are galaxies outside of our local group travel away from us? Do they all travel away from us with the same velocity?
Thanks!!
2. What is the central idea of universal expansion? Are galaxies outside of our local group travel away from us? Do they all travel away from us with the same velocity?
Thanks!!