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C1 emas
| Term | Definition |
|---|---|
| satellite | An object that orbits a planet |
| planet | An object that orbits a star |
| meteor | A streak of light in the sky produced by the burning of a meteoroid |
| comet | A loose collection of ice and dust that orbits the sun, typically in a long, narrow orbit |
| star | A hot ball of gas filled with hydrogen and helium |
| constellation | A pattern or grouping of stars that people image as a figure or object |
| axis | An imaginary line that passes through a planets center and its north and south poles, about which the planet rotates |
| rotation | The spinning motion of a planet on its axis |
| revolution | The movement of an object around another |
| orbit | The path of an object as it revolves around another object |
| calendar | A system organizing time that defines the beginning, length, and divisions of the year |
| solstice | Either two days of the year |
| equinox | Either of the two days of a 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 |
| 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 a object |
| weight | A body's mass or quantity of matter contained by it. |
| inertia | The tendency of an object to resist a change in motion |
| Newton's first law of motion | The scientific law that states that an object at rest will lay at rest and an object in motion will stay in motion |
| phase | One of the different apparent shapes of the moon as seen from earth |
| eclipse | The partial or total blocking of one object in space by another |
| Solar eclipse | The blocking of sunlight to earth |
| umbra | The darkest, central part of a shadow |
| penumbra | The part of a 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 rise and fall of the ocean surface caused by the gravitational pull |
| Spring tide | Is a maximum tidal range occurring twice a month |
| Neap tide | The tide with the least different between consecutive low and high tides |
| maria | Dark, flat areas on the moons surface formed from huge ancient lava flows |
| crater | A large round pit caused by the impact of a meteoroid |
| meteoroid | A streak of light that enters earths atmosphere |
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