4 - 03 Inner Planets

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Last updated 11:33 AM on 6/5/26
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7 Terms

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Planet

A celestial body moving in orbit around a star, which is spherical in shape, and has enough mass to clear its orbit of other similar sized bodies. Earth is a planet.

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Natural Satellite

A naturally existing celestial body that revolves around a

planet.

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Terrestrial Planet

Four smaller, inner planets with rocky surfaces.

<p>Four smaller, inner planets with rocky surfaces.</p>
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Mercury

Closest planet to the sun. Named for the Roman Messenger of the Gods. Similar size to Earth's moon, and like the moon has no atmosphere and is covered with craters caused by asteroid collisions.

<p>Closest planet to the sun. Named for the Roman Messenger of the Gods. Similar size to Earth's moon, and like the moon has no atmosphere and is covered with craters caused by asteroid collisions.</p>
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Venus

Second planet from the sun. Names for the Roman Goddess of Love. Called Earth's Twin due to similar size. Hottest planet in the solar system due to extremely thick atmosphere which traps heat.

<p>Second planet from the sun. Names for the Roman Goddess of Love. Called Earth's Twin due to similar size. Hottest planet in the solar system due to extremely thick atmosphere which traps heat.</p>
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Mars

Fourth planet from the sun. Named for the Roman God of War. Called the Red Planet due to its color caused by iron oxide in its crust. Has two moons.

<p>Fourth planet from the sun. Named for the Roman God of War. Called the Red Planet due to its color caused by iron oxide in its crust. Has two moons.</p>
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Phobos and Deimos

Two moons of Mars. Named for the God of War's

attendants, Fear and Terror. Thought to be asteroids captured by Mars' gravitational pull due to their non-spherical shapes.

<p>Two moons of Mars. Named for the God of War's</p><p>attendants, Fear and Terror. Thought to be asteroids captured by Mars' gravitational pull due to their non-spherical shapes.</p>