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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 (553)
absolute magnitude
brightness of a star as it appears from the Earth (552)
apparent magnitude
type of spiral galaxy with a bar of stars that runs through its center (563)
barred spiral galaxy
pair of stars that revolve around each other (564)
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 (563)
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 star
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 angles
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 space
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