solar system

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Across
  1. 2. The planet closest to the Sun.
  2. 3. The red planet, which scientists study to find life.
  3. 5. A planet or place where life can exist.
  4. 7. A large system of stars, planets and space dust.
  5. 8. A deep hole on the surface of the Moon or a planet.
Down
  1. 1. The largest planet in our solar system.
  2. 4. A living creature from another planet.
  3. 6. A tool scientists use to see stars and planets more clearly.
  4. 7. The force that pulls objects towards the Earth.
  5. 9. A machine used to travel into space.