Planets crossword puzzle

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Across
  1. 4. They are like the Earth in some ways
  2. 6. A celestial object that orbits a planet
  3. 8. The planet closest to the sun.
  4. 10. Layers of gases around a planet.
Down
  1. 1. moved repeatedly around
  2. 2. The four inner planets, and four outer planets are separated by..?
  3. 3. Known as the red planet.
  4. 5. Mercury, Mars, Earth, and Venus are...?
  5. 7. Jupiter, saturn, uranus, and Neptune are..?
  6. 9. The planet known as Earth's sister planet