Across
- 3. An object that has such a great gravitational pull that nothing can escape
- 5. The explosion of a dying supergiant star
- 6. The force that pulls objects together
- 8. The building blocks of planets
- 9. A large group of stars, star systems, star clusters, dust and gas bound together by gravity
- 11. One of the two final stages in a high-mass star's life
- 14. Matter that doesn't give off electromagnetic radiation
- 17. The actual brightness of a star if it were at a standard distance from Earth
- 18. The explosion that expanded and formed the universe
- 20. The spinning motion of a planet on its axis
- 23. When two objects move around each other
- 24. A rapidly spinning neutron star that gives off radio waves
- 25. The leftover core of a star from which the outer layers have drifted off into space
Down
- 1. The first stage in a star's life
- 2. When an object resists any change in its motion
- 4. The brightness of a star as seen from Earth
- 7. Made up patterns in the sky formed by stars
- 10. The study of the moon, stars, and other objects in space
- 12. A system in which the sun is at the center
- 13. A bright, distance galaxy that has a giant black hole in the middle
- 15. The system model in which the Earth is placed in the center
- 16. The distance light travels in one year
- 19. Where all stars begin their lives
- 21. The apparent change of an object when seen from different places
- 22. All of space and everything in it