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| doughnut-shaped region that extends beyond Neptune’s orbit to about 100 times Earth’s distance from the sun. |
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| spherical region of comets that surrounds the solar system out to more than 1,000 times the distance between Pluto and the sun. |
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| the most famous comet in history. |
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| an orbiting trail formed when Halley's nucleus sheds about 6 m (7 yards) of ice and rock into space. |
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| most viewed comet in recorded history. |
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| small and rocky space objects made of metals, silicate, iron, nickel, and carbon. |
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| chunk of rock or dust in space. |
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| a meteoroid that enters Earth’s atmosphere and burns up. |
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| Meteoroids that pass through the atmosphere and hit Earth’s surface. |
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| Life that exists beyond earth’s atmosphere. |
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