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30 Cards in this Set

  • Front
  • Back
Brightness of a star as it would appear if located 32.6
light-years from the Earth.
Absolute Magnitude
Brightness of a star as it appears from the Earth.
Apparent Magnitude
Type of spiral galaxy with a bar of stars that runs through
its center.
Barred Spiral Galaxy
Pair of stars that revolve around each other.
Binary Star
Hole in space with a gravity so great that not even light can escape,
formed by the collapse of a very large supernova.
Black Hole
Describing any star that is always visible in the night sky and,
from the Northern Hemisphere, can be seen circling Polaris.
Pattern of stars.
Type of galaxy with a very bright center that contains little dust
and gas and is spherical to disklike in shape.
Elliptical Galaxy
Large-scale group of stars.
Very large, cool, bright star.
Spherically shaped group of hundreds of stars located around
the core of the Milky Way Galaxy.
Globular Cluster
Hertzsprung-Russell diagram; graph showing the relationship of
the surface temperature and absolute magnitude of a star.
H-R diagram
Type of galaxy with no identifiable shape and an uneven
distribution of stars within it.
Irregular Galaxy
Distance that light travels in one year, about 9.5 trillion km.
Star with characteristics that place it within a band running
through the middle of the H-R diagram.
Main-Sequence Star
Dark cloud of gas and dust in space; first stage in the development of a
Collapsed core of a supernova consisting of a small, extremely
dense ball of neutrons.
Neutron Star
White dwarf star that explodes as it cools, temporarily becoming thousands
of times brighter.
Loosely shaped group of hundreds of stars.
Open Cluster
Method of determining the distance from the Earth to a star based on
the shift in the apparent position of the star when viewed from different
Expanding shell of gases shed by a dying star.
Planetary Nebula
Inside a nebula, the shrinking, spinning center region; the second
stage in the development of a star.
Neutron star that emits two beams of radiation that sweep across
Starlike object that gives off radio waves and X rays.
Apparent lengthening of the light waves emitted by a star moving away
from the Earth.
Red Shift
Type of galaxy with a nucleus of bright stars and flattened arms
that swirl around the nucleus.
Spiral Galaxy
Body of gases that gives off a tremendous amount of radiant energy in the
form of light and heat.
Extremely large, giant star.
Star that blows apart with a tremendous explosion.
Small, hot, dim star.
White Dwarf