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20 Cards in this Set

  • Front
  • Back
Constellation
patterns of start that were named in honor of mythological characters or great heroes.
binary star
pairs of stars pulled toward each other by gravity.
light year
the better unit to express stellar distance, which is the distance light year travels in one year.
apparent magnitude
how bright a star really is.
main sequence star
a star that falls into the category on the H-R diagram; This category contains the majority of stars and runs diagonally from the upper left to the lower right on the H-R diagram.
red giant
a large, cool star of high luminosity; a star occupying the upper-right portion of the H-R diagram.
supergiant
a very large, very bright red giant star. Betelgeuse is a bright red star and part of this category.
Cepheid variable
stars that get brighter and fainter in regular pattern
nova
a sudden brightening of a star. During the eruption, the outer layer of the star is ejected at high speed.
nebulae
clouds of dust and gases. If the interstellar matter is close to a very hot star, it will glow.
protostar
a developing star not yet hot enough to engage in nuclear fusion.
supernova
how stars in their lives in a brilliant explosion.
white dwarf
the remains of low-mass and medium mass stars.
neutron star
the remnants of supernova events.
pulsar
a source that radiates short bursts or pulses of radio energy.
black hole
objects that are very hot, their gravity is so strong that not even light can escape their surface.
galaxy
groups of stars, dust, and gases held together by gravity.
galaxy cluster
a system of galaxies containing from several to thousands of member galaxies, our own is called the Local group.
Hubble's Law
an idea that states that galaxies are retreating from us at a speed that is proportional to their distance.
big band theory
the universe began as a violent explosion from which the universe continues to expand, evolve, and cool.