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| Chapter 2 Our Solar System 8th |
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| Earth is the center of the Solar System |
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| The surfaces of the Largest Planets |
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| The four Outer Planets are |
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| Small and have Rocky surfaces |
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| Chunks of ice and dust that usually have long Elliptical orbits. Solar winds push gas away from the commet and the gas and dust form the commet's tail. |
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| Sun is the center of the planets. Gained support when Galileo observed that Venus goes through phases similar to those of Earth's moon. |
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| Two factors that combine to keep the planets in orbit. |
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| The tendency of a moving object to continue moving in a straight line OR a stationary object to remain in place. |
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| The force that pulls the moon toward Earth |
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| How the sun produces energy. It occurs in the CORE or center of the sun. |
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| There is enough fuel remaining in the sun to last for another |
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| Small with rocky surfaces |
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| Much larger than Earth; made mainly of gases |
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| Different from other planets because it is SMALL and has a SOLID SURFACE.Some astronomers do not think Pluto is a planet because it is so small. |
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| Shape of the orbit of most comets |
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| Located between Mars and Jupiter |
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| Streak of light produced when a meteoroid enters Earth's atmosphere. |
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| A meteoroid that hits Earth's SURFACE |
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| Required for life on Earth |
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| Explained that the sun is the center of the system of planets (Heliocentric) |
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| Unique among the planets because of its oceans |
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| Most Ancient Astronomers believed |
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| All celestial objects revolved around the Earth (Geocentric) |
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| Discovered that Mars's orbit is an ellipse |
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| Located between the small and large planets (between Mars and Jupiter). They are too small to be considered planets |
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| Chucnks of ice and dust about the size of one of Earth's mountains. Most travel in very long and narrow elliptical orbits. |
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| Huge balls of rock or gas whose orbits are nearly circular. |
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| The Planets in order from the sun |
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| Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune (My Very Excellent Mother Just Served Us Nachos) |
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| Mercury, Venus, Earth, and Mars |
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| Jupiter, Saturn, Uranus, Neptune, (Pluto) |
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