| __ | 1. | black hole | | A. | cloud of gas and dust in which new stars form | | __ | 2. | constellations | | B. | gigantic explosion near the end of the life of some stars | | __ | 3. | galaxy | | C. | huge system of stars, dust and gas held together by gravity | | __ | 4. | light-year | | D. | the distance light travels in one year | | __ | 5. | nebula | | E. | point with such strong gravity that nothing nearby escapes | | __ | 6. | supernova | | F. | group of stars that forms a pattern |
| __ | 7. | axis | | A. | the Sun and all planets, moons, asteroids,etc. that orbit it | | __ | 8. | comet | | B. | frozen mass of ice and dust orbiting the Sun | | __ | 9. | revolution | | C. | one full orbit of an object around another object | | __ | 10. | solar system | | D. | spacecraft that gathers data without a probe | | __ | 11. | space probe | | E. | imaginary center line around which the Earth rotates |
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