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15 Cards in this Set

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big bang theory

the theory of the beginning of the universe in an instant, billions of years ago, in an enormous explosion

red shift

a shift toward the red wavelengths of light from stars or galaxies moving away from earth

blue shift

a shift towards the blue wavelengths of light from stars or galaxies moving away from earth

cosmic background microwave radiation

the thermal radiation left from the big bang of cosmology

gas giants

a large, massive planet that is composed mainly of hydrogen and helium

asteroids

small, rocky solar system bodies, most of which are found orbiting the sun in a region between Mars and Jupiter

meteoroid

a chunk of rock that moves through the solar system

comets

a mass of rock, dust, and ice that partially vaporizes when it passes near the sun

stars

a large, glowing ball of gas in space that generates energy through nuclear fusion in it's core

fusion

a nuclear reaction in which the nuclei of two atoms to form a larger nucleus

nebula

a large cloud of gas and dust spread out over a large volume of space

super giants

a very large, massive, bright star ranging in size from 100 to 1000 times the diameter of the sun

giants

a large, massive bright star that is somewhat smaller and fainter than a supergiant

main sequence

a diagonal band on the H-R diagram, which represents about 90% of all stars

white dwarfs

the small, dense, but dim remains of a low or medium mass star