The Universe

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Across
  1. 3. The temperature of a star determines this.
  2. 4. A system of millions or billions of stars.
  3. 6. A light year is a unit of ____________.
  4. 8. The brightness of an object in space compared to our Sun.
  5. 10. A scatter plot of stars.
  6. 13. Electromagnetic radiation found all over the Universe left over from its creation.
  7. 14. Galaxies are held together by this kind of attraction.
  8. 15. This star has a luminosity of 1.
  9. 16. All of space and all the matter space contains.
  10. 17. When a comet gets close to a star, this gas and dust is visible.
  11. 18. An object made of ice and dust.
  12. 21. What a light year is measured in.
  13. 24. Measured for stars in units of Kelvin.
  14. 25. Theory that the Universe began from a very hot and compressed point that expanded rapidly.
  15. 26. An area of space have a gravitational field so intense that no matter or radiation can escape.
Down
  1. 1. Causes the release of light and heat from a star.
  2. 2. A group of smaller stellar objects pulled into orbit around a star.
  3. 5. Shows the color of a star.
  4. 7. Massive ball of gas held together by gravity.
  5. 9. A black hole is formed when one dies.
  6. 11. Lowest temperature possible.
  7. 12. Used to detect electromagnetic radiation.
  8. 19. A cloud of gas and dust in outer space.
  9. 20. How far light travels in one year.
  10. 22. A small rocky object orbiting the Sun or other star.
  11. 23. The group into which a star is classified based on color.