Universe Facts

  • The Universe is everything that we can ever know – all of space and time.
  • The Universe is almost entirely empty, with small clusters of matter and energy.
  • The Universe is probably about 15 billion years old, but estimates vary.
  • One problem with working out the age of the Universe is that there are stars in our galaxy which are thought to be 14 to 18 billion years old – older than the estimated age of the Universe. So either the stars must be younger, or the Universe older.
  • The furthest galaxies yet detected are about 13 billion light-years away (130 billion trillion km).
  • The Universe is getting bigger by the second. We know this because all the galaxies are zooming away from us. The further away they are, the faster they are moving.
  • The furthest galaxies are spreading away at more than 90 percent of the speed of light.
  • The Universe was once thought to be everything that could ever exist, but recent theories about inflation suggest our Universe may be just one of countless bubbles of space-time.
  • The Universe may have neither a center nor an edge, because according to Einstein’s theory of relativity, gravity bends all of space-time around into an endless curve.