Lesson 3 Mercury

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