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