Across
- 1. Spell out the time of one rotation in earth days
- 5. Mercury's takes the least time of any planet.
- 6. The planet closest to the sun.
- 8. NASA mission that orbited Mercury from 2011-2015
- 11. The primary metal making up its core.
- 12. Its position when planets are in order from the Sun.
- 13. The surface is heavily marked by this bowl-like feature.
Down
- 2. 88 earth days makes up one of these on this planet.
- 3. Mercury's lack of this causes extreme temperature swings.
- 4. NASA's first probe to visit Mercury in the 1970s.
- 7. Its diameter when compared to the other planets.
- 9. The extremely thin, tenuous outer layer of this planet.
- 10. This side of the planet can reach 800 degrees Fahrenheit.