James+R

The Big Bang
//Watch a video or read the  story of  the  [|history of the Universe].// The night sky presents  the  viewer with a picture of a calm and unchanging Universe. So the  1929 d  is  covery by Edwin Hubble that  the  Universe  is  in fact expanding at enormous speed was revolutionary. Hubble noted that galaxies outside our own Milky Way were all moving away from us, each at a speed proportional to its d is  tance from us. He quickly realized what  th  is  meant that  the  re must have been an instant in time (now known to be about 14 billion years ago) when  the  entire Universe was contained in a single point in space. The Universe must have been born in th  is  single violent event which came to be known as  the  "  Big Bang  ."