Astronomy

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Across
  1. 3. Unit of distance equal to the distance light travels in one year
  2. 6. Ripple in spacetime
  3. 10. Distant reservoir of comets
  4. 11. Highest point
  5. 13. Instrument used to observe distant objects in the universe
  6. 20. Sudden star brightening
  7. 21. Charged particle in space
  8. 25. Small hot and extremely dense star
  9. 26. Mysterious force driving expansion
  10. 28. Line of celestial rotation
  11. 30. Earth's faithful companion
  12. 31. Bulk
  13. 33. Spectacular display of colored light in the polar skies
  14. 35. Beam of light or energy
  15. 37. Bent light phenomenon
  16. 39. Sun's outer atmosphere
  17. 42. Celestial body's extremity
  18. 43. Point of no return
  19. 45. Celestial beacon
  20. 46. Star charting tool
  21. 48. Heavenly dividing line
  22. 49. Study of the interaction between matter and electromagnetic radiation
  23. 51. Event where one celestial body blocks light from another
  24. 52. Planetary halo
  25. 53. Cosmic gathering
  26. 54. Region of spacetime with such strong gravity that nothing escapes
Down
  1. 1. Process of a star's life cycle from birth to death
  2. 2. Star in its twilight years
  3. 4. Astronomer's measurement tool
  4. 5. Stellar birthplace
  5. 7. Empty space, literally
  6. 8. Explosive event marking the end of a star's life
  7. 9. Change in wavelength due to an object's motion relative to an observer
  8. 12. Face fully lit
  9. 14. Our daily light
  10. 15. Natural satellite orbiting a planet
  11. 16. Extremely dense object formed from a star's core collapse
  12. 17. Star's stable phase
  13. 18. Swirling vortex around a star
  14. 19. Galactic center's dark heart
  15. 22. Cosmic origin story
  16. 23. Collection of stars gas and dust held together by gravity
  17. 24. Small rocky object orbiting the Sun
  18. 27. Icy body that releases gas and dust as it approaches the Sun
  19. 29. Pattern of stars in the night sky
  20. 32. Massive ball of hot glowing gas
  21. 34. Cosmic couple
  22. 36. Red planet
  23. 38. Piece of a meteor that survives its passage through the atmosphere
  24. 40. All of existence including space time and matter
  25. 41. Collection of celestial objects orbiting the Sun
  26. 42. Large celestial body orbiting a star
  27. 44. Path an object follows as it revolves around another
  28. 47. Small particle of debris that burns up in a planet's atmosphere
  29. 48. High-energy visitor from space
  30. 50. Sudden solar outburst