Space & Astronomy

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Across
  1. 2. A trained person who travels into space.
  2. 4. An icy object that develops a tail when near a star.
  3. 6. The scientific study of celestial objects and space.
  4. 8. Motion of an object around another body.
  5. 9. A self-luminous object powered by nuclear fusion.
  6. 12. A force that attracts bodies with mass toward each other.
  7. 15. The smallest planet and closest to the Sun.
  8. 19. A gas giant known for its ring system.
  9. 20. Everything that exists, including all space, matter, and energy.
  10. 23. The point directly above an observer.
  11. 24. A recognizable pattern of stars in the sky.
  12. 26. A layer of gases surrounding a planet.
  13. 27. A unit of astronomical distance based on stellar parallax.
  14. 30. A region dominated by a planet’s magnetic field.
  15. 32. An object that orbits a larger body.
  16. 33. An instrument used to observe distant space objects.
  17. 35. The farthest point of an orbit around Earth.
  18. 37. A massive gravitational system of stars, gas, and dust.
  19. 38. A group of stars or galaxies bound by gravity.
  20. 41. The galaxy containing our Solar System.
  21. 42. The universe viewed as an ordered system.
  22. 43. A natural satellite that orbits a planet.
  23. 45. A depression formed by impact on a surface.
  24. 47. A small rocky object orbiting a star.
  25. 48. A shift in light indicating an object is moving away.
  26. 49. The study of the origin and structure of the universe.
Down
  1. 1. A streak of light caused by a space object entering an atmosphere.
  2. 3. An extremely bright object powered by a black hole.
  3. 5. An event where one celestial body blocks another.
  4. 7. A subatomic particle found in ordinary matter in space.
  5. 8. Spinning of an object around its own axis.
  6. 10. A glowing light display in a planet’s sky caused by particles.
  7. 11. A straight line passing through the center of a circle or sphere.
  8. 13. A point of extreme density in space-time physics.
  9. 14. A celestial body that orbits a star and does not emit light.
  10. 16. The largest planet in the Solar System.
  11. 17. A space object that reaches a planetary surface.
  12. 18. Half of a spherical object.
  13. 21. The point directly opposite the zenith.
  14. 22. The central star of our Solar System.
  15. 25. The path followed by an object under gravitational influence.
  16. 28. A region with extremely low matter density.
  17. 29. Apparent shift in position used to measure distance in space.
  18. 31. A massive stellar explosion marking the end of a star.
  19. 34. A point in the year with the longest or shortest daylight.
  20. 36. A time when day and night are nearly equal.
  21. 39. A vehicle propelled by high-speed exhaust gases.
  22. 40. A planet outside our Solar System.
  23. 44. A cloud of gas and dust in space.
  24. 46. The line where Earth and sky appear to meet.