Universe

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Across
  1. 3. the theory that the universe began with a massive explosion
  2. 7. celestial body that has sufficient mass to be rounded by its own gravity and is not a satellite
  3. 9. study of celestial objects and phenomena
  4. 10. largest structure in the universe, composed of billions of galaxies
Down
  1. 1. the force that attracts objects with mass towards one another
  2. 2. celestial body orbiting around a star
  3. 4. the study of the origin, evolution, and eventual fate of the universe
  4. 5. Planet celestial object that is not a planet, such as a comet or asteroid
  5. 6. celestial object composed of gas, dust, and plasma, held together by its own gravity
  6. 7. region of the cosmos beyond the Earth's atmosphere
  7. 8. Giant celestial object that is significantly larger than a planet and is composed mostly of hydrogen and helium