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Earth & Space

vocabulary

TermDefinition
light year the distance light travels in one year
astronomical unit the average distance between the Earth and the Sun, about 150 million km
apparent magnitude a measure of how bright it appears from Earth
luminosity the true brightness of an object
galaxy a huge collection of stars, gas, and dust held together by gravity
dark matter matter that emits no light at any wavelength
big bang theory the universe began from one point billions of years ago and has been expanding ever since
theory an idea intended to explain something
spiral galaxy type of galaxy that forms arm structures
irregular galaxy type of galaxy that has no regular or symmetrical structure
elliptical galaxy type of galaxy shaped like a spheroid, or elongated sphere
hertzsprung-russell (H-R) diagram a graph that plots luminosity v. temperature of stars
Created by: ckampen
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