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Ch.1 Earth, Moon,Sun
| Term | Definition |
|---|---|
| satellite | An object that orbits a planet |
| planet | An object that orbits a star, is large enough to become rounded by it's own gravity and has cleared the area of it's orbit. |
| meteor | A streak of light in the sky produced by the burning of a meteorite in Earth's atmosphere. |
| comet | A loose collection of ice and dust that orbit's the sun, typically in a long, narrow orbit. |
| star | A ball of hot gas, primarily oxygen and helium, that undergoes nuclear fusion. |
| constellation | A pattern or grouping of stars that people imagine to represent a figure or object. |
| axis | An imaginary light that passes through a planet's center and it's north and south poles, about which the planet rotates. |
| rotation | The spinning motion of a planet of it's axis. |
| revolution | the movement of an object around another object. |
| orbit | The path of an object as it revolves around another object in space. |
| calander | A system of organizing time that defines the beginning, length, and divisions of a year. |
| solstice | Either of the two days of the year on which the sun reaches it's greatest distance north or south of the equator. |
| equinox | Either of the two days of the year on which neither hemisphere is tilted toward or away from the sun. |
| force | A push or pull exerted on an object |
| gravity | the attractive force between objects; the force that moves objects downhill. |
| law of universal gravitation | The scientific law that states that every object in the universe attracts every other object. |
| mass | The amount of matter in an object. |
| weight | A measure of the force of gravity on an object. |
| inertia | The tendency of an object to resist a change in motion. |
| Newton's first law of motion | The scientific law that stars that an object at rest will stay at rest and an object in motion will stay in motion with a constant speed and direction unless acted on by a force. |
| phase | one of the different apparent shapes of the moon as seen on Earth. |
| eclipse | The partial or total blocking of one object in space by another. |
| solar eclipse | The blocking of sunlight to Earth that occurs when the moon is directly between the sun and Earth. |
| umbra | The darkest part of a shadow.The blocking of sunlight to Earth that occurs when the moon is directly between the sun and the Earth. |
| penumbra | The part of the shadow surrounding the darkest part. |
| lunar eclipse | The blocking of sunlight to the moon that occurs when Earth is directly between the sun and the moon. |
| tide | The periodic rise and fall of the level of water in the ocean. |
| spring tide | The tide with the greatest difference between consecutive and low and high tides. |
| neap tide | The tide with the least difference between consecutive and low and high tides. |
| maria | Dark flat areas on the moon's surface formed from huge ancient lava flows. |
| crater | A large round pit caused by the impact of a meteorite. |
| meteoroid | A chunk of rock or dust in space, generally smaller than an asteroid. |
Created by:
abuddana
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