Astronomy Terms

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Across
  1. 4. Group of stars that form a pattern on the celestial sphere
  2. 6. Small rocky object in space
  3. 7. Type of rock found on the Moon
  4. 10. Star that is nearly aligned with Earth's axis
  5. 11. Region with such strong gravity that not even light can escape
  6. 14. Astronomical unit of distance
  7. 16. Scientist who discovered gravity
  8. 18. Stage in a star's life cycle
  9. 19. Icy body that releases gas and dust as it approaches the Sun
  10. 23. Theory of the universe's origin
  11. 25. Smaller group of stars within a constellation
  12. 28. Point at which an orbiting object is closest to the body it orbits
  13. 31. Point in the sky directly above an observer's location
  14. 32. Planet with a thin atmosphere
  15. 33. Large collection of stars and gas
  16. 34. Star at the center of our solar system
  17. 35. Galaxy type with a central bulge
  18. 36. Path the Sun appears to follow in the sky
  19. 38. Small particle that burns up in a planet's atmosphere
  20. 39. Boundary beyond which nothing can escape a black hole's gravity
  21. 41. Planet with a tilted axis
  22. 42. Planet with the Great Red Spot
Down
  1. 1. Celestial body that orbits the Sun
  2. 2. Study of the universe's origin and evolution
  3. 3. Rotating, pulsing star that emits electromagnetic radiation
  4. 5. Celestial body that orbits a planet
  5. 8. Device used to study the universe
  6. 9. Measure of a star's brightness
  7. 12. Planet with the most moons
  8. 13. Measure of a star's temperature
  9. 15. Point at which an orbiting object is farthest from the body it orbits
  10. 17. Process of creating heavier elements within stars
  11. 20. Moon phase between new and full
  12. 21. Interstellar cloud of gas and dust
  13. 22. Small, hot, and extremely dense star
  14. 24. Important particle in nuclear reactions within stars
  15. 26. Type of eclipse where the Moon passes between Earth and Sun
  16. 27. Alignment of three celestial bodies, such as the Earth, Moon, and Sun
  17. 29. Extremely luminous object thought to be powered by a supermassive black hole
  18. 30. Apparent shift of a nearby star's position against the background of more distant stars
  19. 35. Astronomical event marking a star's explosion
  20. 37. Scientist who proposed the heliocentric model
  21. 40. Path an object follows as it revolves around another