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groups of stars that make a pattern
constellations
Speed of a light-year
300,000 km/s
enormous explosion that destroys a star
supernova
fusion of nuclei into one big nucleus (energy)
Nuclear Fusion
area in space with so much gravity, no light can escape
black hole
The Hertzsprung-Russell diagram compares
luminosity and temperature
cloud of gas and dust (where stars are born)
nebula
distance of an Astronomical Unit (AU)
150,000,000 km
closest star to our sun
Proxima Centuri
The galaxy cluster with the Milky Way in it:
Local Group
Type of shift in a Doppler shift that determines expansion
red shift = expanding
list four types of stars
varying answers (white dwarf, main sequence, red supergiant, red giant, blue giant, blue supergiant)
The most common type of star
main-sequence stars
Greek astronomer who studied stars over 2,000 years ago
Ptolemy
outermost part of a star
star's corona
lighted part of a star
star's photosphere
Greek astronomer, assigned a number to the stars
Hipparchus
large group of stars, planets and other objects
galaxy
invisible matter that makes up 90% of the universe
dark matter
actual brightness of a star
absolute magnitude
List the colors of stars from hottest to coolest:
blue, white, yellow, orange, red
dense neutron-filled core that is left behind after a supernova
neutron star
instrument that allows astronomers to look at different wavelengths
spectroscope
A hot, dense smaller star
white dwarf
how bright a star appears from earth
apparent magnitude