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10 Cards in this Set

  • Front
  • Back
Universe
everything in space
Astronomer
a scientist who studies the universe.
Refracting Telescope
a telescope that gathers light with a lens.
Reflecting Telescope
a telescope that uses a mirror to gather light.
Observatory
a place where astronomers study the sky.
Space Probe
an unmanned craft sent out into space; space probes do not orbit planets.
Astronomical Unit
the average distance from the Earth to the Sun. = 93,000,000 miles.
Light Year
the distance light travels in one year.
Constellation
a group of stars named for an object, person, or animal.
Galaxy
a group of stars, dust, and gases held together by gravity.