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| The system of thinking that Earth is at the center of the revolving planets and stars. |
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| The system of thinking that Earth and other planets revolve around the sun. |
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| An oval shape, which may be elongated or nearly circular. |
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| A natural satellite that revolves around a planet. |
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| A system of measures used to describe distances in the solar system. |
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| The process in which two nuclei combine forming one nuclei and then releasing energy which energizes the sun. |
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| A region of very tightly packed gas where energy is transferred mainly in the form of electromagnetic radiation |
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| The outermost layer of the suns interior. |
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| The inner layer of the suns atmosphere. |
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| The middle layer of the suns atmosphere. |
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| The outer layer of the sun which looks like a white halo. |
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| Electrically charged solar particles given off by the corona of the sun. |
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| Areas of gas on the suns surface that are cooler than the gases around them. |
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| Huge reddish loops of gas that connect different sunspots on the sun. |
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| The eruption of gases into the sun. |
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| The trapping of heat by the atmosphere. |
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| The four planets ( Jupiter, Saturn, Uranus, and Neptune) that are made out of gas and do not have solid surfaces. |
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| A thin disk of small particles of ice and rock. |
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| Loose collections of ice, dust, and small rocky particles whose orbits are usually very long, narrow ellipses. |
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| Clouds of gas and dust form a fuzzy outer layer. |
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| The solid inner core of a comet. |
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| A doughnut-shaped region that extends from beyond Neptune's orbit to about 100 times Earth's distance from the sun. |
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| A spherical region of comets that surrounds the solar system from about 1,000 to 10,000 times the distance between the Sun and Pluto. |
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| Rocky, frozen and other material between planets. |
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| A major region in the Solar System in which a lot of asteroids revolve around the sun. |
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| A chunk of rock or dust in space. |
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| The streaking light that passes through the sky when a meteoroid comes into Earths atmosphere. |
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| Meteorides that pass through the Earths atmosphere and hit the Earth's surface. |
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| Life other than that on Earth. |
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