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Chapter 21

Stars, Galaxies and the Universe

TermDefinition
apparent brightness the brightness of a star as seen from Earth
absolute brightness the brightness the star would have if it were a standard distance from Earth (must be calculated)
light-year the distance that light travels in one year (9.5 million, million kilometers)
parallax the apparent change in position of an object when you look at it from different locations
nebula a large cloud of gas and dust that is spread out
protostar a contracting cloud of gas and dust; beginnings of a star
supernova the explosion of a super giant star
black hole an object in space with enough gravity so strong that nothing, not even light can escape
Milky Way the spiral galaxy that includes our solar system
constellation an imaginary pattern of stars
Hertzsprung-Russell diagram (H-R diagram) used to classify stars and how they change over time
Created by: Science4u
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