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24 Cards in this Set

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The rainbows of colors produced when white light passes through a prism or spectrograph

spectrum

how bright a light looks or appears

Apparent magnitude

the actual brightness of a star

absolute magnitude

the distance that light travels in one year

Light-year

an apparent shift In the position of an object when viewed from different locations

Parallax

a graph showing the relationship between a star's surface temperature

H-R diagram

a diagonal pattern of stars on the H-R diagram

main sequence

a small, hot star near the end of its life; the leftover center of an old star

white dwarf

a star that expands and cools once it runs out of hydrogen fuel

red giant

the death of a large star by explosion

supernova

a star in which all the particles have become neutrons; pressed-in remains of a supernova

neutron star

a spinning neutron star that emits rapid pulses of light

pulsar

an object with more than three solar system masses squeezed into a ball only 10 km across whose gravity is so strong that not even light can escape

black whole

large groupings of starts in space

galaxies

a galaxy with a bulge in the center and very distinctive spiral arms

spiral galaxy

a spherical or elongated galaxy with a bright center and very little dust and gas

elliptical galaxy

is a galaxy that doesn't fit into any other class and their shape is irregular

irregular galaxy

clouds of gas and dust

nebulas (nebulae)

are groups of older stars that looks like a ball of stars

globular cluster

groups of starts that are usually located along the spiral disk of a galaxy newly formed clusters have many bright blue stars

open clusters

a "quasi-stellar" object; a starlike source of light that is extremely far away; one of the most powerful sources of energy in the universe

quasar

the study of the origin and future of the universe

cosmology

states that the universe began with a tremendous explosion

big bang theory

radiation left over from the big bang that fills all of space

cosmic background radiation