Astronomy

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Across
  1. 2. One full trip a planet makes around the Sun
  2. 3. A huge group of stars, dust, and gas held together by gravity
  3. 7. One full spin of a planet on its axis
  4. 11. A natural object that orbits a planet
  5. 12. The area beyond Earth’s atmosphere
  6. 13. The rise and fall of ocean water caused by the Moon’s gravity
  7. 15. A spacecraft that explores space without people on board
  8. 18. The path one object takes around another in space
  9. 19. A space rock that burns in Earth’s atmosphere
  10. 20. When one space object blocks light from another
  11. 24. Another word for the universe
  12. 27. An object that orbits a planet; can be natural or man-made
  13. 28. The star at the center of our solar system
  14. 29. The force that pulls objects toward each other
  15. 30. The distance light travels in one year
Down
  1. 1. A cloud of gas and dust in space where stars are born
  2. 4. The imaginary line Earth spins around
  3. 5. A space object made of ice and dust with a glowing tail
  4. 6. Relating to the Sun
  5. 8. A tool used to see things far away in space
  6. 9. Everything in space, including all stars and galaxies
  7. 10. When a spacecraft is sent into space
  8. 14. A bowl-shaped hole on the surface of a planet or moon
  9. 16. A rocky object that orbits the Sun, smaller than a planet
  10. 17. A giant ball of hot gas that gives off light and heat
  11. 21. A large object that orbits a star like the Sun
  12. 22. A person trained to travel in space
  13. 23. A place in space with gravity so strong not even light can escape
  14. 25. Way The galaxy that includes our solar system
  15. 26. Relating to the Moon