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