ASTRONOMY

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Across
  1. 2. A small rocky body orbiting the Sun
  2. 4. The largest planet in our solar system
  3. 8. A group of stars forming a recognizable pattern
  4. 10. When one celestial body moves into the shadow of another
  5. 11. Second man to set foot on the Moon
  6. 12. The star at the center of our solar system
  7. 15. A region of space where gravity is so strong, nothing can escape
  8. 17. Earth's only natural satellite
  9. 18. Earth's spinning on its axis
  10. 19. The "Red Planet"
  11. 21. A space rock that enters Earth's atmosphere
  12. 22. A massive system of stars, gas, and dust
  13. 24. A celestial body orbiting a star
  14. 26. The Sun and all the objects orbiting it
  15. 27. Earth's "sister planet"
  16. 28. When day and night are of equal length
Down
  1. 1. The longest or shortest day of the year
  2. 2. A person trained for space travel
  3. 3. The explosive death of a massive star
  4. 5. An instrument to observe distant objects in space
  5. 6. A dwarf planet in our solar system
  6. 7. A massive, glowing sphere of gas in space
  7. 9. The first man to walk on the Moon
  8. 13. The path of a celestial body around a star or planet
  9. 14. A rapidly spinning neutron star emitting radiation
  10. 16. A ball of ice, dust, and gas that orbits the Sun
  11. 20. The theory explaining the universe's origin
  12. 21. The galaxy that contains our solar system
  13. 23. Earth's orbit around the Sun
  14. 25. Planet known for its rings