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earth is part of this galaxy
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
how much light is actually given off from a star
everything--all the stars, galaxies, etc.
the longest wavelength
the shortest wavelength
device that splits the light from the stars into visible light
hydrogen and helium
two main gases in all stars
the distance a ray of light can travel in one year
color of the hottest stars
color of the coolest stars
area of extreme gravity that results from a supernova
the brightest thing in the universe