Time is relative, and the universe is constantly expanding from "summary" of Astrophysics for People in a Hurry by Neil deGrasse Tyson
Time, as we experience it here on Earth, is not fixed. It is relative. This means that time can speed up or slow down depending on how fast an object is moving or how strong the gravitational pull is. This concept was first proposed by Albert Einstein in his theory of relativity. The universe itself is in a state of constant expansion. This means that galaxies are moving away from each other at incredible speeds. The farther away a galaxy is, the faster it is moving away from us. This discovery, known as the Hubble expansion, was made by astronomer Edwin Hubble in the early 20th century. As the universe expands, it also evolves. New sta...
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