• What is the Milky Way?
  The Milky Way is a pale blotchy white band that stretches right ...

• Where is the Earth?
  The Earth is just over halfway out along one of the spiral arms of ...

• What are star clusters?
  Stars are rarely entirely alone within a galaxy. Most are ...

• What are double stars?
  Our Sun is alone in space, but many stars have one or more nearby ...

• What is the biggest thing in the universe?
  The biggest structure in the universe is the Great Wall-a great sheet ...

• Are the stars getting farther away?
  Analysis of red shifts has shown us that every single galaxy is ...

• What is red shift?
  When a galaxy is moving rapidly away from us the waves of light ...

• What is a light-year?
  A light-year is 5.88 trillion miles. This is the distance light can ...

• What is a parsec?
  A parsec is 3.26 light-years. Parsecs are parallax ...

• What is the farthest star we can see?
  The farthest objects we can see in space are quasars, which may be ...