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Ch. 21 Earth Science

7th Grade finals test

TermDefinition
telescope A device that makes distant objects appear to be closer
electromagnetic radiation energy that can travel through space in the form of waves
wavelength distance between the crest of one wave and the crest of the next wave
spectrum a range of different colors of different wavelengths
optical telescope uses lenses or mirrors
refracting telescope uses convex lens
convex lens a piece of transparent, curved glass
reflecting telescope a curved mirror that collects light
radio telescopes curved lenses that reflect other waves and focus on radio
observatory a building that contains one or more telescopes
constellation an imaginary pattern "drawn" by the stars
spectrograph breaks light in to colors and and produces images of it
apparent brightness brightness seen on earth
absolute brightness the brightness the star would have if it were at a standard disatnce from Earth
light year distance that light travels in one year
parallax apparent change in position of an object when looking at it from a different place
main sequence surface temperature increases, and is the main life of a star
binary star a two star system
eclipsing binary a binary system in which the dim star eclipses the bright star
open cluster a much less dense cluster of stars
globular cluster a much more dense cluster of stars with millions of them
galaxy a group of stars, dust, and ice held together by gravity
quasar active young galaxies with giant black holes
universe all of space and everything in it
Created by: WhiteWyvern95