Universe Definition Matching
| __ | 1. | Celestial Body | | A. | sphere of gas with nuclear reactions at its core | | __ | 2. | Galaxy | | B. | billions of stars and planets held together by gravity | | __ | 3. | Gravity | | C. | the force that holds celestial bodies in a circular orbit | | __ | 4. | Moon | | D. | rocky, spherical object that orbits a star | | __ | 5. | Nebula | | E. | all matter and energy that exists | | __ | 6. | Planet | | F. | any object located in space (ex: planet, moon, star, comet) | | __ | 7. | Solar System | | G. | large cloud of gas and dust where stars are formed | | __ | 8. | Star | | H. | spherical object that orbits a planet | | __ | 9. | Sun | | I. | closest, medium-sized star to Earth | | __ | 10. | Universe | | J. | system of planets and smaller objects orbiting the sun |
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