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Ch 1 Earth Moon Sun
| Term | Definition |
|---|---|
| Lesson 1 | Lesson 1 |
| satelite | 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 its orbit |
| meteor | A streak of light produced in the sky by the burning of a meteoroid in Earths atmosphere |
| comet | A loose collection of ice and dust that orbits 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 person or object |
| Lesson 2 | Lesson 2 |
| axis | A imaginary line that goes through the center of a planet and it's north and south poles about which it rotates. |
| rotation | The spinning motion of a planet on 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 |
| calendar | A system of organizing the time that defines the beginning length and divisions of a year |
| solstice | Either of the two days where the sun reaches its greatest distance from the north or south pole |
| equinox | Either of the two days of the year on which neither hemisphere is tilted away from the sun |
| Lesson 3 | Lesson 3 |
| force | A push or a pull exerted on an object |
| gravity | The attractive force between objects |
| law of universal gravitation | The scientific law that states that every object attracts all other objects |
| mass | The amount of matter in an object |
| weight | The measure of the force of gravity on an object |
| inertia | The tendency of an object to resist a change in movement |
| Newtons first law of motion | The scientific law that states that every object that rests will stay rested and every object in motion will stay in motion with a constant speed. |
| Lesson 4 | Lesson 4 |
| phase | One of the different shapes of the moon seen from earth |
| eclipse | The partial of total blocking of an object by another object in space |
| solar eclipse | When the moon blocks the sunlight completely from earth |
| umbra | The darkest part of a shadow |
| penumbra | The shadow surrounding the darkest part |
| lunar eclipse | When the earth blocks the sunlight from the moon |
| Lesson 5 | Lesson 5 |
| tide | The periodic rise and fall of water in the ocean |
| spring tide | The tide with the greatest difference between the consecutive high and low tides |
| neap tide | The tide with the least difference between the consecutive high and low tides |
| Lesson 6 | Lesson 6 |
| maria | Dark flat areas on the moon formed from huge ancient lava flows |
| crater | A large pit caused by an impact of a meteoroid |
| meteoroid | A chunk of rock or dust in space usually smaller than an asteroid |
Created by:
alefer003
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