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11 Cards in this Set

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constellation
A group of stars that form a fixed pattern in the nights sky.
axis
An imaginary straight line from the North Pole through Earth's center to the South Pole. Earth makes one complete turn on its axis in about 24 hours.
rotation
The spinning motion of an object on its axis. It takes about 24 hours for Earth to make one complete rotation.
revolution
The movement of an object around another object or point. It takes about 365 days to make one revolution around the Sun.
star
A huge globe of hot gases that shines by its own light. Many stars may have systems of planets around them.
planet
A large body in space that orbits a star and does not produce light on its own.
refracting telescope
An instrument for viewing distant objects that uses two lenses to gather light and produce an image.
reflecting telescope
An instrument for viewing distant objects that uses a curved mirror at the back of its tube to gather light and produce an image.
comet
A small object in space made of ice, dust, gas, and rock that orbits a star and that can form a gaseous tail. A comet begins to melt and to glow as it approaches the Sun.
meteors
A piece of rock or metal from space that enters Earth's atmosphere. A meteor is also called a shooting star.
meteorite
The remaining material of a meteor that has landed on the ground.