The Universe

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
everything--all the stars, galaxies, etc.
radio waves
the longest wavelength
gamma rays
the shortest wavelength
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
color of the coolest stars
black holes
area of extreme gravity that results from a supernova
a supernova
the brightest thing in the universe