astronomy

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Across
  1. 2. A system that uses radio waves to detect objects.
  2. 4. Marineris A huge canyon on Mars.
  3. 6. Neptune’s largest moon that orbits backward.
  4. 9. Basin A large impact crater on Mercury.
  5. 11. Limit The distance where a moon would break apart from gravity.
  6. 15. Planets Small, rocky planets like Earth and Mars.
  7. 16. When sunlight breaks molecules apart.
Down
  1. 1. Moons Jupiter’s four largest moons discovered by Galileo.
  2. 3. Mons The largest volcano in the solar system, on Mars.
  3. 5. Planets Large gas giant planets like Jupiter and Saturn.
  4. 7. Systems Bands of ice and rock orbiting a planet.
  5. 8. One of Mars’s small moons.
  6. 10. Terra A highland region on Venus.
  7. 12. The largest moon in the solar system, orbiting Jupiter.
  8. 13. Mars’s smaller outer moon.
  9. 14. Streams Fast-moving winds in a planet’s atmosphere.
  10. 15. Saturn’s largest moon with a thick atmosphere.
  11. 17. A steep cliff on a planet’s surface.