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| A description of the solar system in which all of the planets revolve around Earth |
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| A description of the solar system in which all of the planets revolve around the sun. |
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| An elongated circle, or oval shape, the shape of the planets' orbits. |
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| The tendency of a moving object to continue in a straight line or a stationary object to remain in place. |
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| The combining of two atomic nuclei into a single larger nucleus, as when two hydrogen atoms join together to form helium, releasing energy. |
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| The central-part of the sun, where nucleus fusion occurs. |
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| The inner layer of the sun's atmosphere |
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| The middle layer of the sun's atmosphere. |
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| The outer layer of the sun's atmosphere. |
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| A stream of electrically charged particles produced by the sun's corona. |
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| Dark, cooler regions on the surface of the sun. |
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| A loop of gas that protrudes from the sun's surface, linking parts of sunspot regions. |
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| An explosion of hydrogen gas from the sun's surface that occurs when loops in sunspot regions suddenly connect. |
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| The name given to the four inner planets: Mercury, Venus, Earth, and Mars. |
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| The spinning motion of a planet from east to west, opposite to the direction of rotation of most planets and moons. |
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| The process by which heat heat is trapped in the atmosphere by water vapor, carbon dioxide, methane, and other gases that form a "blanket" around Earth. |
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| The name given to the first four outer planets Jupiter, Saturn, Uranus, and Neptune. |
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| A ball of ice and dust whose orbit is a long, narrow ellipse. |
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| Objects revolving around the sun that are too small and too numerous to be considered planets. |
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| The region of the solar system between the orbits of Mars and Jupiter, where many asteroids are found. |
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| A chunk of rock or dust in space. |
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| A streak of light in the sky produced by the burning of a meteoroid in Earth's atmosphere. |
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| A meteoroid that has hit Earth's surface. |
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| Life that arises outside of Earth. |
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