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| a portion of the universe and all of its components, processes, and interactions |
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| Made up of 8 planets, including Earth, and many smaller objects that orbit around the Sun |
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| Closest planet to the Sun, smallest planet, does not have a true atmosphere, has a surface with many craters and high cliffs |
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| second planet from the Sun; similar to Earth in mass and size; has a thick atmosphere and a surface with craters, faultlike cracks, and volcanoes. |
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| third planet from the Sun; has an atmosphere that protects life and surface temperatures that allow water to exist as a solid, liquid, and gas |
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| fourth planet from the Sun; has polar ice caps, a thin atmosphere, and a reddish appearance caused by iron oxide in weathered rocks and soil |
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| largest and fifth planet from the Sun; contains more mass than all the other planets combined, has continuous storms of high-pressure gas, and an atmosphere mostly of hydrogen and helium |
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| giant, high pressure storm in Jupiter's atmosphere |
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| a natural satellite of a planet that is held in its orbit around the planet by the planet's gravitational pull |
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| an instrument that is sent to space to gather information and send it back to Earth |
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| second-largest and sixth planet from the Sun; has a complex ring system, at least 31 moons, and a thick atmosphere made mostly of hydrogen and helium |
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| seventh planet from the Sun; is large and gaseous, has a distinct bluish-green color, and rotates on an axis nearly parallel to the plane of its orbit |
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| usually the eighth planet from the Sun; is large and gaseous, has rings that vary in thickness and is bluish-green in color. |
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| a nearly circular depression in a planet, moon, or asteroid that formed when an object from space hit its surface |
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| space object made of dust and rock particles mixed with frozen water, methane, and ammonia that forms a bright coma as it approaches the Sun |
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| a meterioid that burns up in Earth's atmosphere |
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| a meteroid that strikes the surface of a moon or planet |
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| a piece of rock or metal made up of material similar to that which formed the planets; mostly found in the asteroid belt between the orbits of Mars and Jupiter |
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