• Is there life on Mars?
  The Viking landers of the 1970s found not even the minutest trace of ...

• What are the inner planets made of?
  Each of the inner planets is formed a little bit like an egg-with a ...

• Could you breathe on Mercury?
  Not without your own oxygen supply. Mercury has almost no atmosphere ...

• How hot is Mercury?
  Temperatures on Mercury veer from one extreme to the other because it ...

• What is the air on Venus?
  Venus's atmosphere would be deadly for humans. It is very deep, so ...

• Why is Venus called the Evening Star?
  Venus reflects sunlight so well it shines like a star. But because it ...

• What are the giant planets made of?
  Jupiter and Saturn are made largely of hydrogen and helium. On ...

• How windy is Saturn?
  Saturn's winds are even faster than Jupiter's and roar round the ...

• How heavy is Saturn?
  Saturn may be big, but because it is made largely of liquid hydrogen, ...

• What is the Cassini division?
  Saturn's rings occur in broad bands labelled with the letters A to G. ...