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Earth, Sun, Moon
| Term | Definition |
|---|---|
| orbit/revolution | the path one object takes as it revolves around another object in space |
| crater | bowl-shaped indents or cavities on the surface of a planet that are caused by a collision with another object |
| moon | a natural satellite that orbits a planet |
| sun | the star at the center of our Solar System and supplies heat and light to Earth; its gravity keeps the system in orbit |
| Earth | a planet in our Solar System that has life on it |
| gravity | a force that pulls objects toward the center of Earth |
| celestial body | any natural body outside earth's atmosphere |
| eclipse | to obscure the light from or to another celestial body |
| comet | a celestial body of ice and dust, and when near the sun, has a tail of dust and gas particles pointing away from the sun |
| asteroid | a small, rocky body orbiting the sun |
| star | a fixed luminous point in the sky |
| satellite | an artificial or celestial body orbiting the sun or another planet |
| rotation | the time it takes the Earth to make on complete rotation on its axis (24 hour period) |
| axis | a line, real or imaginary, around which something spins |
| compass | an instrument that shows direction and uses a small magnet to show North. (N, E, S, W) |
| shadow | a dark area caused when an object blocks light falling on a surface |
| sundial | an instrument that measures the time of day using the position of the sun |
| day/night | Earth faces the sun and is lit; Earth faces away from the sun and is dark |
| atmosphere | the gases surrounding the earth or another planet |
| inertia | a tendency todo nothing or remain unchanged |
| revolution/orbit | the movement of one object around a center or another object |
| tilt | to cause to lean, incline, slope, or slant |
| seasons | each of the four divisions of the year that result from the earth's changing position with regard to the sun |
| tide | the rise and fall of sea levels caused by the gravitational forces exerted by the moon/sun, and rotation of the earth |
Created by:
rwilson125
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