Astronomy - Skyler Gomer

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Across
  1. 4. the next stage of a star after a nebula forms. It has so much energy, that is will "shine" brightly
  2. 7. the change in frequency of a wave in relation to an observer who is moving relative to the wave source
  3. 9. Jupiter, Saturn, Uranus, and Neptune are in what planet-class?
  4. 10. a cloud of dust and gas
Down
  1. 1. the star closest to Earth
  2. 2. all of space and time and their contents, including planets, stars, galaxies, and all other forms of matter and energy is the what?
  3. 3. The next stage of a star after the main sequence. The star is in its final stages.
  4. 5. a hypothesis that is supported by the results of experimentation and observation
  5. 6. when a star is especially massive, it explodes and forms this. No light is able to enter.
  6. 8. Mercury, Venus, Earth, and Mars are in what planet-class?