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20 Cards in this Set
- Front
- Back
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an instrument that can make objects look closer by looking through it
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telescope
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an oval shaped orbit
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ellipse
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the force that gravity exerts on an object
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weight
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a star that Earth's northern axis points to
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Polaris
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the distance light travels through space in one year
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light year
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an object made of ice, rock, dust, and gas that orbits the sun and can form a tail
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comet
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a rocky body that orbits around the sun. Mostly found between the orbits of Mars and Jupiter.
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asteroid
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a small object traveling through space. When it enters the Earth's atmosphere, it becomes a meteor.
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meteoroid
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a neighbor of a planet that was not created by humans (moons)
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natural satellite
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a neighbor that gathers data and communicates
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artificial satellite
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National Aeronautics and Space Administration. The government agency responsible for space flight and reasearch
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NASA
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the orbiting of one object (such as the Earth), around another (such as the Sun)
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revolution
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the spinning of a planet on it's axis
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rotation
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the path that a body takes around an object of stronger gravity. To travel around an object, as in revolve.
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orbit
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the imaginary line that Earth spins around on whose tilt is responsible for seasons
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axis
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invisible force that keeps us on our feet
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gravity
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the first day of spring or autumn. It occurs when direct sunlight hits the equator. Length of day and night is 12 hours.
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equinox
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when direct sunlight hits The
Tropic of Cancer or Capricorn. When these occur, the earth will experience either the longest or shortest daylight of the year. |
solstice
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the changes in the level of ocean water during the course of a day.
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tides
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the apparent shape of the moon as seen from earth. We only see the lit part of the moon
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moon phase
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