In less than a century, the accepted picture of the universe transformed from a stagnant place, comprised entirely of our own Milky Way galaxy, to a realm inhabited by billions of individual galaxies, hurtling away from one another. In this title, the author describes his principal observations and conclusions.

In less than a century, the accepted picture of the universe transformed from a stagnant place, composed entirely of our own Milky Way galaxy, to a realm inhabited by billions of individual galaxies, hurtling away from one another. We must thank, in pa