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| a rocky mass up to several hundred kilometers wide that revolves around the Sun |
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| the layer of gases that surrounds Earth and other planets |
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| an imaginary center line around which the Earth rotates |
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| a point in space that has such a strong force of gravity that nothing within a certain distance of it can escape |
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| a frozen mass of ice and dust orbiting the Sun |
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| a group of stars that forms a pattern |
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| a push or pull that acts on an object |
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| a huge system of stars, dust, and gas held together by gravity |
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| the force of attraction that exists between any two objects; causes objects to have weight |
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| the distance light travels in one year |
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| a natural satellite that orbits a planet |
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| a cloud of gas and dust in which new stars form |
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| a large object in space that orbits a star |
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| one full orbit of an object around another object |
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| one whole spin of an object on its axis |
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| an object in orbit around another object |
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| the Sun and all the bodies that orbit it |
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| a spacecraft that gathers data without a crew |
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| a place where people can live and work in space for long periods of time |
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| a gigantic ball of very hot gasses that gives off electromagnetic radiation |
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| a gigantic explosion that occurs near the end of the life of some stars |
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