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| A region of space that includes all the planets, moons, and other objects that revolve around a star. |
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| A large body in space that moves in a curved path around a star. |
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| The four planets closest to the sun - Mercury, Venus, Earth and Mars. |
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| The four planets farthest from the sun - Jupiter, Saturn, uranus, and Neptune. |
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| A scientist who studies the universe. |
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| a space body made up of ice, dust, and small, gritty particles. |
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| a natural object that revolves around a planet. |
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| A large piece of space rock with an irregular shape. |
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| A streak of light caused by a meteoriod that enters Earth's atmosphere and burns up. |
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| a meteoroid that lands on Earth. |
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| the movement of a body in space around another body. |
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| the path of a body in space revolving around another body. |
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| the movement of a space object such as Earth turning on its own axis. |
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| an imaginary line through the center of a planet or another body. |
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| a blanket of gases and dust that surrounds a planet or moon. |
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| a huge group of stars held together by gravity. |
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| A theory about the formation of the universe stating that all matter was once all together and then it was blown apart. |
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| law of Universal gravitation |
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| a scientific law that states that every object in the universe attracts every other object. |
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| Newton's First law of motion |
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Definition
| A scientific law that states that an object is at rest will stay at rest and an object in motion will stay in motion unless acted upon by an outside force. |
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| the tendency of an object to stay either at rest or in motion along the same path. |
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| the amount of matter in an object. |
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| an apparent shape of the lit half of the moon as seen from Earth. |
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| an eclipse of the moon, which occurs when Earth comes between the sun and the moon and Earth casts a shadow on the moon. |
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| a complete set of the moon's phases that is completed about every 29.5 days. |
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| getting larger, as when the lit part of the moon appears to get larger between the new moon and full moon phases. |
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| getting smaller, as when the lit part of the moon appears to get smaller between the full moon and new moon phases. |
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| An event that happens when one object in space, blocks light from reaching a second object, casting a shadow on the second object. |
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| An eclipse of the sun, which occurs when the moon comes between Earth and the sun. |
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| a scientific explanation of related observations. |
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| a theory of the solar system that placed Earth at its center. |
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| the theory of the solar system that places the sun at its center. |
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| an apparent shape of the lit half of the moon as seen from Earth |
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