The Final Frontier (Space and Planets)

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Across
  1. 3. A layer of gases surrounding a planet or star's surface.
  2. 5. the closest star to Earth.
  3. 6. Comets,_________ and stars are all example of 'celestial objects'.
  4. 8. The 'equator' of a planet or moon is an imaginary line around the _________.
  5. 10. The emptier parts of the universe between solar systems are called interstellar _________.
  6. 11. What we call the outer layer of Earth's surface.
Down
  1. 1. An object or planet that is 'spherical' is shaped like a ________.
  2. 2. What we call the very centre of the Earth.
  3. 4. The largest planet in our solar system.
  4. 6. The Earth has magnetic North and South _________.
  5. 7. The planet in our solar system with the most visible rings.
  6. 9. The fourth planet out from our sun.
  7. 10. If the surface of the sun reaches out (flares) towards Earth, we call this a solar _______.