Mercury Crossword

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Across
  1. 4. The spacecraft that passed near Mercury in 1974 and 1975 (don't use a space)
  2. 5. Planets that are not solid, but instead are made of gas
  3. 7. Rocks that orbit in space, sometimes crashing into planets and other satellites
Down
  1. 1. Planets that are "earth-like," having a solid surface upon which you can stand
  2. 2. This word means to pass over. We use this word to describe when Mercury passes between the Earth and the sun.
  3. 3. A spacecraft that travels without a person inside
  4. 6. A hole on the surface of a planet or moon caused by the impact of an asteroid