• What is the biggest star?
  The biggest stars are the supergiants. Antares is 700 times as big as ...

• How fast does Jupiter spin?
  Jupiter spins faster than any other planet. Despite its huge size, it ...

• How many moons has Jupiter?
  Jupiter has 16 moons-four big ones, discovered by Galileo as long ago ...

• What is Jupiter’s red spot?
  The Great Red Spot or GRS is a huge swirling storm in Jupiter's ...

• How big is Jupiter?
  Very big. Even though Jupiter is largely gas it weighs 320 times as ...

• Could you land on Jupiter?
  No. Even if your spaceship could withstand the enormous pressures, ...

• What is the solar wind?
  The solar wind is the stream of radioactive particles constantly ...

• What are solar flares?
  Flares are eruptions from the Sun's surface that fountain into space ...

• What’s frightening about Mars’s moons?
  One night American astronomer Asaph Hall got fed up with studying ...

• Why is Mars red?
  Mars is red because it is rusty. The surface contains a high ...