Mercury and the Moon

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Across
  1. 1. Old bright lunar highlands that refuse to be flat.
  2. 3. The first beeping satellite that startled Earth in 1957.
  3. 4. The idea that a giant collision blasted out the material for the Moon.
  4. 5. owner of the most famous footprint in history.
  5. 8. Quick sky streaks made by vaporizing space dust.
  6. 9. Round holes made when space rocks punched the Moon.
  7. 10. Smooth areas between Mercury’s craters.
  8. 12. America’s first space traveler with a quick hop upward.
  9. 13. When Mercury or Venus sit between Earth and the Sun.
  10. 15. A small NASA mission that mapped the Moon then moved on.
  11. 16. When Mercury is farthest from the Sun and cools off.
  12. 17. The line between lunar day and night, not a movie robot.
  13. 19. When the Moon always shows the same side because it likes routine.
  14. 21. The idea that the Moon spun off from a young Earth.
  15. 23. Long grooves on the Moon that look like scratches.
  16. 24. A spacecraft that snooped around the Moon for hidden materials.
Down
  1. 2. robotic missions that visited the Moon before humans.
  2. 3. cliffs formed when Mercury shrank and wrinkled.
  3. 6. The idea that Earth grabbed the Moon like a passing stray.
  4. 7. Planets closer to the Sun than Earth: Mercury and Venus.
  5. 8. The Sea of Tranquility, a calm lunar landing zone.
  6. 11. When Mercury gets closest to the Sun and heats up.
  7. 14. that survive the trip and hit the ground.
  8. 18. Rocky leftovers that never grew up to be planets.
  9. 20. smooth areas on the Moon that look like seas but stay dry.
  10. 22. Program NASA’s missions that actually sent humans to the Moon.