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Ch8 Stars, Galaxies,

Stars, Galaxies, and the Universe

the band of color produced when white light passes through a prism is a spectrum
the brightness of a star as seen from the Earth is the apparent magnitude
the brightness a star would have at a distance of 32.6 light-years from Earth is the absolute magnitude
the distance light can travel in one year is 9.5 trillion kilometers and is called a light-year
an apparent shift in the position of an object when viewed from different locations is called parallax
a large reddish star late in its life cycle that expands and cools once it uses all of its hydrogen is a red giant
a small, hot, dim star that is the leftover of an old star is a white dwarf
a graph that shows the relationship between a star's surface temperature and absolute magnitude is called a H-R diagram
the location on the H-R diagram where most stars lie is the main sequence
a gigantic explosion in which a massive star collapses and throws its outer layers into space is called a supernova
a star that has collapsed under gravity to the point that the electrons and protons have smashed together to form neutrons is a neutron star
a rapidly spinning neutron star that emits rapid pulses of radio and optical energy is a pulsar
an object so massive and dense that even light cannot escape its gravity is called a black hole
a collection of stars, dust, and gas bound together by gravity is a galaxy
a large cloud of dust and gas in interstellar space; a region in space where stars are born or where stars explode at the end of their lives is a nebula
a tight group of stars that looks like a ball and contains up to 1 million stars is a globular cluster
a group of stars that are close together relative to surrounding stars is an open cluster
a very luminous, starlike object that generates energy at a high rate; thought to be the most distant objects in the universe quasar
Created by: Giannola