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Astronomy (entire)

all of the astronomy text

astronomy the study of universe
astr- star, heavens, outerspace
light-year the distance that light travels in one year; about 9.46 trillion kilometers
spectrum the band of colors produced when light passes through a prism
apparent magnitude the brightness of a star as seen from the Earth
absolute magnitude the brightness that a star would have at a distance of 32.6 light-years from Earth
ab- from, away
parallax an apparent shift in the position of an object when viewed from different locations
Red Giant a large, reddish star late in its life cycle
White Dwarf a small, hot, dim star this is the left-over center of an old star
H-R Diagram Hertzsprung-Russell diagram, a graph that shows the relationship between a star’s surface temperature and absolute magnitude
Supernova a gigantic explosion in which a missive start collapses and throws its outer layers into space
super- greater than normal, excessive
Black Hole an object so massive and dense that even light cannot escape its gravity
Galaxy a collection of stars, dust, and gas bound together by gravity
Nebula a large cloud of gas and dust in interstellar space; a region in space where stars are born or where stars explode at the end of the lives
Cosmology the study of the origin, properties, processes, and evolution of the universe
Rotation the spin of a body in its axis
Orbit the path that a body follows as it travels around another body in space
Revolution the motion of a body that travels around another body in pace; one complete trip along an orbit
Phase the change in the sunlit area of one celestial body as seen from another celestial body
Eclipse an event in which the shadow of one celestial body falls on another
Comet a small body of ice, rock, and cosmic dust that follows an elliptical orbit around the sun and that gives off gas and dust in the forms of a tail as it passes close to the sun
Asteroid a small, rocky object that orbits the sun, usually in a band between the orbits of Mars and Jupiter
Asteroid Belt the region of the solar system that is between the orbits of Mars and Jupiter and in which most asteroids orbit
Meteoroid a relatively small, rocky body that travels through space
Meteorite a meteoroid that reaches the Earth’s surface without burning up completely
Meteor a bright streak of light that results when a meteoroid burns in the Earth’s atmosphere
Created by: RABBARNETT