Stars
color of a star depends on its________
temperature
the H-R diagram shows the relationship of a star's surface temperature and its______________
absolute magnitude
name the 3 types of galaxies
spiral, elliptical, irregular
theory that states that the universe began with a huge explosion
big bang theory
the brightness of a star as it appears to an observer on earth
apparent magnitude
what 2 things can a scientist learn about a star from its spectrum
composition and temperature
what objects can be formed from the materials in the core of a supernova
black holes and neutron stars
a group of closely grouped stars
open cluster
radiation left over from the big bang that fills all of space
cosmic background radiation
the brightness of a star at a distance of 32.6 light years from earth
absolute magnitude
what do the black lines on a stars absorption spectrum show?
light that is absorbed by the star's atmosphere
name the 3 stages of a stars life cycle
main sequence, red giant, white dwarf
a tight group of stars that look like a ball
globular cluster
study of the origin, structure and future of the universe
cosmology
a large grouping of stars in space
galaxy
what color is the hottest stars? coldest?
blue, red
small, hot dim star that is the leftover center of an old star
white dwarf
very bright star like object that generates immense energy
quasar
what do scientists think will happen to the universe
it will continue to expand outward and exist forever
gigantic explosion that causes the death of a large star
supernova
apparent shift in an object's position when viewed from different locations
parallax
spinning neutron star that emits rapid pulses of radio and optical energy
pulsar
a large cloud of dust and gas where new stars are formed or stars explode
nebula
how are objects organized in the universe
according to a loosely repeated pattern and are part of a larger system
star in which the electrons and protons have become neutrons
neutron star