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Milky Way

earth is part of this galaxy

apparent magnitude

how bright a star seems from earth

sprial, elliptical, and irregular

three basic types of galaxies

HR (Herzsprung-Russell) diagram

a chart that sorts stars by their luminosity and temprature

absolute magnitude

how much light is actually given off from a star

universe

everything--all the stars, galaxies, etc.

radio waves

the longest wavelength

gamma rays

the shortest wavelength

spectroscope

device that splits the light from the stars into visible light

hydrogen and helium

two main gases in all stars

light year

the distance a ray of light can travel in one year

bluish white

color of the hottest stars

red

color of the coolest stars

black holes

area of extreme gravity that results from a supernova

a supernova

the brightest thing in the universe

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