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Elliptical galaxy
A galaxy shaped like a round or flattened ball,generally containing only old stars.
Irregular galaxy
A galaxy that does not have a regular shape.
Spiral galaxy
A galaxy with a bulge in the middle and arms that spiral outward in a pinwheel patter.
Galaxy
A huge group of single stars,star systems,star clusters,dust,and gas bound together by gravity.
Quasar
An enormously bright,distant galaxy with a giant black hole at its center.
Scientific notation
A mathematical method of writing numbers using powers of ten.
Universe
All of space and everything in it.
(21.5 how the universe formed)
Big Bang
The initial explosion that resulted in the formation and expansion of the universe.
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