Astronomy Vocab

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Across
  1. 3. A round pit on a moon's surface
  2. 6. The spinning motion of a planet about its axis
  3. 7. A contracting cloud of gas and dust; the earliest stage in a star's life
  4. 9. The presumed final stage of a white dwarf
  5. 12. An object that revolves around another object in space
  6. 16. A star that has collapsed under its own gravity
  7. 18. A meteoroid that has hit the Earth's surface.
  8. 20. The movement of an object around another object
  9. 21. All of space and everything around it
Down
  1. 1. The path of an object as it revolves around another object in space
  2. 2. The two days of the year on which neither hemisphere is tilted toward or away from the sun.
  3. 4. A small rocky body orbiting the sun
  4. 5. A natural object that orbits a planet
  5. 8. A large body in space that orbits a star and does not produce light of its own
  6. 10. A celestial body of hot gases that radiates energy derived from thermonuclear reactions in the interior
  7. 11. an object in space whose gravity is so strong not even light can escape
  8. 13. A streak of light in the sky produced by the burning of a meteoroid in Earth's atmosphere
  9. 14. A pattern of stars in the sky
  10. 15. A system of millions or billions of stars, together with gas and dust, held together by gravitational attraction.
  11. 17. A large cloud of gas and dust in space that is the first stage of star formation.
  12. 19. A piece of interplanetary material that falls toward Earth and enters its atmosphere