Neil deGrasse Tyson’s Astrophysics for People in a Hurry

In the beginning, nearly fourteen billion years ago, all the space and all the matter and all the energy of the known universe was contained in a volume less than one-trillionth the size of the period that ends this sentence. I had the pleasure of visiting the American Museum of Natural History in New YorkContinue reading “Neil deGrasse Tyson’s Astrophysics for People in a Hurry”