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