What Is a Star?

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Across
  1. 2. scientist who study space
  2. 3. the second closest star to Earth
  3. 6. process of hydrogen atoms combining to create helium
  4. 8. the negative effects of all manmade lights
  5. 10. all stars are balls of this type of gas
Down
  1. 1. protects Earth from and humans from harmful effects of solar flares
  2. 4. appears as colorful lights in night sky when electrically charged particles collide
  3. 5. Norse sun goddess
  4. 7. sudden eruptions of brightness on the sun's surface that release huge amounts of energy
  5. 9. a group of many shooting stars