Our solar system

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Across
  1. 2. The force that keeps a planet from moving in orbit.
  2. 4. The Earth turning on its own axis is called _____________.
  3. 6. Layer of gas that surrounds a planet.
  4. 8. A star and the planets orbit around it.
Down
  1. 1. Planet closest to the Sun.
  2. 3. What do we call the chunks of rock that travel around the Sun?
  3. 5. The second planet closest to the Sun.
  4. 7. Nicknamed 'the red planet'.