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Space
Unit 11 Vocabulary
Question | Answer |
---|---|
rotation | a 24 hour period or the time it takes the Earth to make one complete rotation on its axis |
axis | a line, real or imaginary, around which something spins |
day | the time during rotation when the Earth faces the sun and it is lighted |
night | the time during rotation when the Earth faces away from the sun and it is dark |
shadow | a dark area caused when an object blocks light falling on a surface |
moon | a natural satellite that orbits a planet |
orbit | the path one object takes as it revolves around another object in space |
craters | bowl-shaped indents or cavities on the surface of a planet, moon, or asteroid that are caused by a collision |
surface | the outermost covering or layer |
revolution | when one heavenly body in space travels around another (such as the Earth traveling around the sun every 365 days or 1 year). |
compass | Instrument that uses a small magnet to show which direction is North (N) |
Earth | A planet in the Solar System that has life on it |
Gravity | A natural force that causes two objects to pull toward each other depending on their mass and the distance between them |
Sun | The star at the center of the Solar System that supplies heat and light to Earth; its enormous gravity keeps the solar system in orbit |
Mass | The amount of matter in an object |
Weight | The heaviness of an object; force of gravity on mass = weight |