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13 Cards in this Set

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astronomer
A sicentist who studies the universe.
astronomical unit
A unit of measure equal to the average distance between the earth and the sun.
constellation
A group of stars named for an object,person,or animal.
galxay
stars,dust,and gases held together by gravity.
ligth year
the distance ligth travels in one year.
magnitude
A way to measure the brigthness of a star
observatory
A place where astronomers study the sky.
radio telescope
A telescope that gathers radio waves from objects in space.
reflecting telescope
A telescope that uses mirrors to gather ligth.
refracting telescope
A telescope that gathers light with a lens.
satellite
An object that circles another object in space.
space probe
an unmanned craft sent into space; space probes do not orbit planets or other bodies.
universe
everything in space.