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| A spinning disk of material that forms from a solar nebula, which may form a solar system. |
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| A rock that orbits the sun and contains little to no ice. |
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| 1 AU is the average distance between the Earth and the sun. |
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| A large block of ice and rock that orbits the sun. |
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| An oblong circle that has two foci to define its shape. |
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| All orbits have elliptical shapes, with the object being orbited at one focus of the ellipse. |
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| A planet that is outside of our solar system. |
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| Plural of focus; each ellipse has two foci that define the shape of the ellipse. |
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| A focus is one of the parameters of an ellipse that defines the shape; each ellipse has two foci. |
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| Planets much larger than Earth that are composed primarily of gas. |
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| A belt of comets that lies on the outer boundary of our solar system. |
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| A doughnut-shaped ring of asteriods that lies between the orbits of Mars and Jupiter. |
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| A meteoroid that enters Earth's atmosphere. |
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| A meteor that falls all the way to Earth's surface. |
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| Chunks of comets or asteroids that fly through outer space. |
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| An asteriod that comes closer than 1.3 AU to Earth. |
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| A hypothetical sphere of comets that envelopes our entire solar system. |
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Definition
| A large cloud of gas and dust that can collapse to form an accretion disk. |
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