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25 terms

Sun and Stars

STUDY
PLAY
photosphere
The visible surface of the sun
solar prominance
A bright loop in the Sun's corona
corona
The sun's atmosphere
sunspot
A dark spot on the photosphere of the sun
radiation zone
Energy from the star moves out through this zone
core
Most of the Sun's mass is in this layer
solar flare
A brief burst of energy from the sun's photosphere
solar wind
A fast-moving stream of particles thrown into space by solar flares
convection zone
In this zone, cooler particles are pulled down by gravity
fusion
The combining of hydrogen particles
granules
Hot bright areas, gives a grain look to the surface of the Sun
galaxy
Group of stars, gas and dust
light-year
Distance light travels in one year
main-sequence
Most common type of star
universe
Everything that exists
apparent magnitude
How bright a star appears to be
absolute magnitude
The actual brightness of the star
spiral galaxy
Arms of the galaxy contain young stars, protostars, dust and gas
barred galaxy
it is similar to a spiral galaxy but the spiral extends from a bar of stars that stretches from the center
elliptical galaxy
They range from almost spherical like a baseball to to a shape like a flattened football they do not seem to rotate
irregular galaxy
Group of stars with not obvious shape
white dwarf
The star continues to shine dimly for billions of years as it slowly cools
red giant
The star may expand to 100 times its former size.
nebula
A star begins within a huge cloud of hydrogen, helium, and tiney particles of dust
protostar
After millions of years, the particles begin to squeeze together, attracted to each other by gravity. As it grows in mass, its temperature rises until it begins to glow