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T6.3 Stars&Galaxies
T6.3 Stars and Galaxies
Term | Definition |
---|---|
parallax | a way to determine the distance to nearby stars and other objects |
star systems | groups of two or more stars |
binary stars | system of two stars that are gravitationally bound to and in orbit around each other |
multiple star systems | system of three or more stars orbiting each other |
exoplanet | a planet revolving around a star outside our own solar system |
star clusters | many stars loose and disorganized in larger groupings |
globular clusters | large groupings(possibly more than a million stars) of older stars in a rounded formation |
galaxy | a group of single stars, star systems, star clusters, dust, and gas bound together by gravity. |
Spiral Galaxies | have a bulge in the center and arms that spiral outward like pinwheels |
Elliptical Galaxies | rounded, but may be elongated and slightly flattened |
Irregular Galaxies | do not have regular shapes |
Quasars | active, young galaxies with black holes at their glowing center |