Astronomy Vocab Unit 7

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Across
  1. 1. ____ Planet A round object in space that orbits the Sun but is smaller than a planet and has not cleared its path.
  2. 3. Everything that exists, including all space, stars, galaxies, and planets.
  3. 8. An imaginary line that goes through the middle of a planet that it spins around.
  4. 9. A tool used to see faraway objects in space more clearly.
  5. 11. The movement of one object going all the way around another object.
  6. 13. An object that orbits a planet. It can be natural (like the Moon) or man-made.
  7. 16. The force that pulls objects toward each other, like how Earth pulls things down.
  8. 17. ___ Planet: A large planet made mostly of gases instead of solid rock.
  9. 18. A group of stars that form a pattern in the sky, like pictures or shapes.
  10. 19. A ball of ice, dust, and rock that orbits the Sun and sometimes has a glowing tail.
  11. 20. A small, rocky object that orbits the Sun, mostly found between Mars and Jupiter.
  12. 21. System The Sun and everything that orbits around it, including planets, moons, asteroids, and comets.
Down
  1. 2. When the visible part of the Moon is getting bigger.
  2. 4. The area beyond Earth's atmosphere where planets, stars, and galaxies exist.
  3. 5. ___ Theory: The idea that the Sun is at the center and the planets move around it.
  4. 6. A streak of light in the sky caused by a space rock burning up as it enters Earth's atmosphere (often called a shooting star).
  5. 7. ___ Planet: A small, rocky planet with a solid surface.
  6. 10. When the visible part of the Moon is getting smaller.
  7. 12. The rise and fall of ocean water caused mostly by the Moon's gravity.
  8. 14. The path an object takes as it moves around another object in space.
  9. 15. The spinning of an object on its axis.
  10. 17. A huge group of stars, dust, gas, and planets held together by gravity.