Space and objects in space 8th

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Across
  1. 4. the amount of energy that is given off the surface of a star
  2. 5. appears to have a bulge in the center and arms in a spiral
  3. 6. do not have regular shapes
  4. 8. are shaped like round or flattened balls
  5. 9. a giant ball of hot gas made up of mostly of hydrogen and helium
Down
  1. 1. something that the characteristics of a group or type
  2. 2. the sun and all the planets are called
  3. 3. the distance that light travels in one year
  4. 7. is a huge system composed of stars, dust, gas, planets, and other objects bound by gravity.