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Stars

TermDefinition
Protostar a young star in the early stages of formation; nuclear fusion begins; is first classified as a star
Main Sequence longest part of a star's life; 90% of all stars are in this stage; 3rd stage in the life cycle of a star
Magnitude the brightness of a star
Absolute Magnitude how bright a star really is
Apparent Magnitude how bright a star will appear to an observer on Earth
Luminosity measure of a star's brightness
Hertzsprung-Russell (HR) Diagram a chart that plots stars based upon their temperature and brightness; shows color, spectral class, and magnitude
Sun average sized star located in the Main Sequence on the HR Diagram; the center of our Solar System
Nebula a large cloud of dust and gas held together by gravity; the first stage in a star's life cycle
Black Hole an object with a gravitational pull so strong that not even light can escape; is at the center of the Milky Way; last step in life cycle for an extremely high mass star
Universe all of space and everything in it
Milky Way the galaxy in which we reside; a spiral galaxy that contains about 400 billion stars
Spiral Galaxy a galaxy that is flat and disk shaped with a central bulge and "arms" that extend outward; often contains a black hole at the center
Elliptical Galaxy a galaxy that is shaped like a round or flattened ball, generally containing only old stars; the most abundant type of galaxy in the universe
Irregular Galaxy a galaxy that has no distinct pattern or shape, less than 5% of know galaxies are this type
Created by: mweenink
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