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Galaxies

TermDefinition
galaxy systems of stars and interstellar matter that make up the universe
universe all of space and everything in it
solar system system consisting of the Sun and a collection of objects of varying sizes and conditions—including planets and their moons—that are held in orbit around the Sun by its gravitational pull on them
spiral galaxy a galaxy exhibiting a central nucleus or barred structure from which extend curved arms of higher luminosity
irregular galaxy a galaxy that does not have a distinct regular shape
elliptical galaxy a galaxy that has a generally circular or oval shape and that has no apparent internal structure or spiral arms
Milky Way galaxy the spiral-shaped galaxy of which the Sun and Earth's Solar System are located and contain the myriads of stars that create the light of the Milky Way
Earth's location in the Milky Way galaxy our solar system sits about 26,000 light-years away from the galaxy’s center, on the edge of the smaller Orion Arm
star a giant ball of hot gas, made mostly of hydrogen and helium
light year the distance that light travels in one year, about 9.46 trillion kilometers
Created by: user-2001242
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