Stars and Galaxies

12345678910111213141516171819202122
Across
  1. 4. The distance light travels in one year.
  2. 7. A violent explosion of a massive star.
  3. 8. Way The spiral galaxy that contains our solar system.
  4. 9. hole An object with gravity so strong that not even light can escape.
  5. 11. magnitude How bright a star appears from Earth.
  6. 13. shift When light waves stretch, showing an object is moving away.
  7. 14. A large, glowing ball of gas that produces energy through nuclear fusion.
  8. 17. A huge group of stars, gas, and dust held together by gravity.
  9. 18. A very large star near the end of its life cycle.
  10. 19. Patterns of light used to determine a star’s composition and temperature.
  11. 21. galaxy A galaxy with no definite shape.
Down
  1. 1. galaxy A galaxy with a central bulge and spiral arms.
  2. 2. shift When light waves compress, showing an object is moving closer.
  3. 3. star An extremely dense remnant of a supernova made mostly of neutrons.
  4. 5. galaxy A galaxy that is round or oval-shaped.
  5. 6. A group of stars that form a recognizable pattern.
  6. 9. star A system of two stars that orbit each other.
  7. 10. A forming star that has not yet begun nuclear fusion.
  8. 12. A cloud of gas and dust in space where stars can form.
  9. 15. magnitude How bright a star actually is.
  10. 16. dwarf A small, hot, dense star that remains after a red giant sheds its outer layers.
  11. 20. sequence star A star that is fusing hydrogen into helium and is in a stable stage of its life.
  12. 22. giant A large, cool star that forms when a star begins to run out of hydrogen fuel.