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The imaginary line that passes through Earth’s center and the North and South Poles.

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The spinning of earth on its axis.

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The movement of one object around another.

The path of an object as it revolves around another object in space.

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The name given to the first 4 outer planets.

Earth-like planets (the 4 inner planets)

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The name given to the first 4 outer planets.

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Thin disk of small particles of ice and rock.

An object that revolves around another object in space.

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A spacecraft that carries scientific instruments that can collect data.

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Model of the universe that has the earth as center of the solar system.

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Model of the universe that has the sun as the center of our solar system.

Rocky object revolving around the sun that are too small and numerous to be planets.

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A loose collection of ice, dust and small rocky particles, typically with a long, narrow orbit of the sun.

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A chunk of rock or dust in space.

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A graph relating the surface temperature and absolute magnitude of the stars.

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The brilliant explosion of a dying super giant star.

A large cloud of gas and dust in space, spread out in an immense volume.

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An object whose gravity is so strong that nothing, not even light, can escape.

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The distance light travels in one year (186,000 m/s).

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