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Star Systems And Galaxies
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Published on Nov 19, 2015
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1.
Most stars are members of groups. Groups of two or more stars are called star systems.
Photo by
markkilner
2.
Types of star systems
Binary Stars: 2 stars
Triple stars: 3 stars
Eclipsing binaries:
1 star periodically blocks the other
Star Clusters: formed from same nebula
Photo by
European Southern Observatory
3.
Galaxy is a huge group of single stars, star systems, star clusters, dust and gas held together by gravity
Photo by
Billy Huynh
4.
3 types of galaxies
Spiral galaxies
Elliptical galaxies
Irregular galaxies
Photo by
NASA's Marshall Space Flight Center
5.
Spiral galaxies have a bulge in the middle with arms that spiral out like a pinwheel. Arms contain bright, young stars and gas and dust. Few new stars in bulge.
Photo by
Gray Lensman QX!
6.
Elliptical galaxies look like round or flat balls. Contain billions of stars but no gas or dust. No new forming stars only old stars.
Photo by
Hubble Heritage
7.
Irregular galaxies have no shape. Typically smaller. Have bright young stars, gas, dust , new forming stars
Photo by
Hubble Heritage
Marybeth Mineo
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