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Lesson 11-2
Earth's Movement in Space
| Term | Definition |
|---|---|
| axis | An imaginary line that passes through Earth's center and the North and South poles, about which Earth rotates |
| rotation | The spinning motion of a planet on its axis |
| revolution | The movement of an object around another object |
| orbit | The path of an object as it revolves around another object in space |
| solstice | Either of the two times of the year when the sun is at its greatest distance from the equator |
| equinox | The two days of the year on which neither hemisphere is tilted toward or away from the sun |
| gravity | A force of attraction between objects that is due to their masses. |
| law of universal gravitation | the scientific law that states that every object in the universe attracts every other object |
| inertia | The tendency of an object to resist a change in motion |
| hypothesize | to develop an evidence-based idea that can be tested by experimentation or investigation |
| hemisphere | one half of the earth |
| direct sunlight | Sunlight that is highly concentrated or focused |
| indirect sunlight | Sunlight that has low concentration or is spread across a large area |
| equator | an imaginary line drawn around the earth equally distant from both poles, dividing the earth into northern and southern hemispheres |
| ellipse | A elongated circle, or oval shape, the shape of the planets orbit. |
| axial tilt | the angle at which a planet tilts, Earth is at 23.5° |
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