6.11A CELESTIAL OBJECTS
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| CELESTIAL OBJECTS | Objects such as planets, moons, & stars that are located in the sky or in space.
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| SYSTEM | Group of interacting or interdependent parts forming a complex whole; for example, all the factors or variables in an environment, or all the planetary bodies revolving around a star.
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| SOLAR SYSTEM | Sun together with the group of planets & other celestial bodies that are held by its gravitational attraction & revolve around it.
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| GRAVITY | Force that causes objects with mass to attract one another.
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| ORBITAL PATH | Gravitationally curved path of an object around a point in space.
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| SUN | Luminous celestial body around which Earth & other planets revolve & from which they receive heat & light.
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| STAR | Ball of gas in space that produces its own light & heat.
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| PLANET | Any of the large celestial bodies that revolve around the Sun in the solar system.
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| INNER PLANET | Any of the rocky, terrestrial planets of Mercury, Venus, Earth, & Mars, whose orbits are inside the asteroid belt.
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| ROCKY | Made of rocks.
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| TERRESTRIAL | Earth-like; "Terra-" = Earth
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| OUTER PLANET | Any of the planets Jupiter, Saturn, Uranus, & Neptune, whose orbits lie beyond the asteroid belt.
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| ASTEROIDS | Large & small rocks or metallic masses orbiting the Sun; made up of materials similar to those that formed the planets.
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| ASTEROID BELT | Region between the inner & outer planets where most asteroids orbit around the Sun.
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| METEROID | Natural chunk of rock or dust existing outside of Earth’s atmosphere.
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| METEOR | Small object that enters Earth’s atmosphere from space & burns due to friction, thus emitting light.
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| METEORITES | Remains of meteoroids that strike the surface of Earth or the Moon.
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| SATELLITE | Something that orbits around another object; for example, a moon orbiting a planet or a human-made object orbiting Earth.
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| MOON | Celestial body that revolves around a planet.
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| COMET | Celestial body of ice, dust, & rock with an elongated & elliptical orbit.
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| COMA | Glowing, heated dust & vaporized gas that surrounds the icy comet nucleus as it travels near the Sun; solar winds cause heated gases to stream out of the nucleus & form a tail that points away from the Sun.
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