Unit 5 - Universe

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Across
  1. 3. clouds of dust and gas; site of star formation; remains of dead or dying stars
  2. 5. A very large and bright star whose hot core has used most of its hydrogen
  3. 6. the measure of the observed visible brightness of a star
  4. 8. A well-tested explanation based on facts and evidence.
  5. 9. the galaxy which contains our Sun and its solar system, including Earth
  6. 10. A galaxy shaped like a flattened ball, containing only old stars.
  7. 12. a galaxy with a bulge in the middle and arms that spiral outward in a pinwheel pattern
  8. 14. the force that pulls all objects in the universe towards each other
  9. 16. the classification of stars according to their temperatures and color; sun is G
  10. 17. A large, cool, bright star in the later stage of its life.
  11. 19. A small, hot, dim star that is the leftover center of an old star
  12. 20. A glowing ball of gas that makes its own light and heat through nuclear fusion.
  13. 21. total amount of light (energy) emitted by a star or other celestial body
  14. 22. the small, dense remains of a high-mass star after a supernova
  15. 24. A region in space where gravity is so strong that nothing, not even light, can escape.
  16. 28. electromagnetic radiation that remains from the Big Bang and early stages of the universe
Down
  1. 1. When light from a star or galaxy stretches out, showing it's moving away.
  2. 2. idea that the universe began from a single point and expanding ever since.
  3. 4. a system of stars and associated matter held together by gravitational attraction
  4. 7. how bright a star actually is
  5. 11. a diagram that shows the relationship between the brightness, surface temperature, and color of stars
  6. 13. A galaxy with no regular shape.
  7. 15. the brightness of a star as seen from Earth
  8. 18. A baby star forming inside a nebula.
  9. 23. A cooled-down, dim leftover of a white dwarf star.
  10. 25. A powerful explosion that happens when a big star dies.
  11. 26. sun, planets, and all the other objects that revolve around the sun
  12. 27. large, hot, bright star at the upper-left end of the main sequence on the H-R diagram