Science Unit 3 Vocab

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Across
  1. 5. An enormous explosion that destroys a star.
  2. 8. A star with a much larger radius and luminosity than a main-sequence star of the same surface temperature.
  3. 10. The distance light travels in one year.
  4. 11. An invisible form of energy that creates a repulsive force, causing the universe to expand.
  5. 12. A graph that plots luminosity vs. temperature of stars.
  6. 15. May form from leftover matter from a supernova.
  7. 19. A galaxy that has a generally elliptical shape and has no apparent internal structure or spiral arms.
  8. 21. Low-mass star type, longest lifespan of all star types.
  9. 22. Forms as the core of a giant star no longer supports fusion, and the star's outer layers escape into space, leaving a hot and dense core.
  10. 23. A star's brightness if placed at a standard distance (32.6 light-years).
  11. 25. The shift to a different wavelength.
  12. 26. An area in space that is so dense that nothing, including light, can escape its gravitational pull.
  13. 27. Formed when a small mass star begins to run out of fuel, its core shrinks and its outer portion expands.
  14. 28. A galaxy with no identifiable shape or structure.
Down
  1. 1. A star that fuses hydrogen into helium in its core.
  2. 2. Formed after helium in a star's core is gone, it casts off its gases.
  3. 3. A star's brightness as seen from Earth.
  4. 4. Leftover energy from the Big Band.
  5. 6. What a large mass star becomes after it runs out of fuel, expanding.
  6. 7. An invisible form of matter that does not emit any detectable electromagnetic energy of its own.
  7. 9. The theory that the universe began as a point and has been expanding ever since.
  8. 13. A large ball of gas held together by gravity with a core so hot that nuclear fusion occurs.
  9. 14. A huge collection of stars, gas, and dust.
  10. 16. A galaxy exhibiting a central nucleus from which extend curved arms of higher luminosity.
  11. 17. The spiral galaxy of which the Sun and solar system are a part.
  12. 18. A cloud of gas and dust.
  13. 20. A cloud of gas and dust in space that develops into a star.
  14. 24. All of space and everything in it including stars, planets, and galaxies.