Astronomy

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