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17 Terms

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Asteroid

Pieces of rock found mostly in the asteroid belt between Mars and Jupiter; made up of minerals similar to those that formed the planets

<p>Pieces of rock found mostly in the asteroid belt between Mars and Jupiter; made up of minerals similar to those that formed the planets</p>
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Astronomical Unit

A unit of measure equal to 150 million km, which is the average distance from Earth to the Sun, and is used to measure the distances between the planets

<p>A unit of measure equal to 150 million km, which is the average distance from Earth to the Sun, and is used to measure the distances between the planets</p>
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Axis

The imaginary line that Earth spins around and whose tilt is responsible for Earth's seasons

<p>The imaginary line that Earth spins around and whose tilt is responsible for Earth's seasons</p>
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Comet

An object in the solar system made up of ice, dust, and frozen gases that develops a tail of light when it swings close to the Sun

<p>An object in the solar system made up of ice, dust, and frozen gases that develops a tail of light when it swings close to the Sun</p>
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Eclipse

An event that happens when the moon passes between the Sun and Earth (Solar Eclipse) or Earth passes between the Sun and the Moon (Lunar Eclipse) producing a shadow

<p>An event that happens when the moon passes between the Sun and Earth (Solar Eclipse) or Earth passes between the Sun and the Moon (Lunar Eclipse) producing a shadow</p>
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Galaxy

A group of starts, gas, and dust held together by gravity - for example, the Milky Way Galaxy, which contains 200 billion stars

<p>A group of starts, gas, and dust held together by gravity - for example, the Milky Way Galaxy, which contains 200 billion stars</p>
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Gravity

A pull that every objects exerts on every other object and that pulls all things toward Earth in the same way

<p>A pull that every objects exerts on every other object and that pulls all things toward Earth in the same way</p>
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Revolution

The movement of Earth in a regular, curved path around the Sun, which takes one year to complete

<p>The movement of Earth in a regular, curved path around the Sun, which takes one year to complete</p>
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Rotation

The spinning of Earth on its imaginary axis, which occurs once every 24 hours and causes the day and night cycle

<p>The spinning of Earth on its imaginary axis, which occurs once every 24 hours and causes the day and night cycle</p>
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Satellite

A spacecraft that is launched into space to gather information and send it back to Earth

<p>A spacecraft that is launched into space to gather information and send it back to Earth</p>
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Solar System

The planets and numerous other objects, such as asteroids, that orbit the Sun

<p>The planets and numerous other objects, such as asteroids, that orbit the Sun</p>
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Star

A massive celestial body of gas that is held together by its own gravity; produces energy and gives off its own light

<p>A massive celestial body of gas that is held together by its own gravity; produces energy and gives off its own light</p>
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Tide

The changes in the level of ocean water during the course of a day - caused by the pull of gravity between Earth, the moon and the Sun

<p>The changes in the level of ocean water during the course of a day - caused by the pull of gravity between Earth, the moon and the Sun</p>
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Planet

A celestial body larger than an asteroid or comet; produces NO light of its own, but is lit by a star in which it orbits

<p>A celestial body larger than an asteroid or comet; produces NO light of its own, but is lit by a star in which it orbits</p>
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Universe

All space, matter, and energy, including Earth, the galaxies and everything in them, as a whole

<p>All space, matter, and energy, including Earth, the galaxies and everything in them, as a whole</p>
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Waning

The change in the Moon's appearance when it appears to be getting SMALLER from night to night

<p>The change in the Moon's appearance when it appears to be getting SMALLER from night to night</p>
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Waxing

The change in the Moon's appearance when it appears to be getting LARGER from night to night

<p>The change in the Moon's appearance when it appears to be getting LARGER from night to night</p>

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