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Galaxy
Question | Answer |
---|---|
Universe | -all existing matter and space considered as a whole -it has been expanding since the BB about 13 billion years ago |
Galaxy | -a system of millions or billions of stars made of gas and dust, held together by gravitational attraction |
Disk Shaped galaxy | -same as a spiral |
Spiral shaped galaxy | -spiral or disk shaped -has 'arms' -dense center |
Irregular shaped galaxy | -No defined shape -No clear bulge or disk -the leftovers of two colliding galaxies |
Elliptical shaped galaxy | -Oval-shaped -most abundant galaxies in the universe -most are composed of older, low mass stars |
Milky Way | -the galaxy we live in -spiral/disk shaped galaxy |
Light Year | -The distance light travels in one year -travels about 180,000 miles/sec |
Cluster | -A group of similar things or people positioned or occurring closely together |
Andromeda Galaxy | -a Spiral/disk shaped galaxy is the galaxy nearest to the Milky Way |