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Star Systems and Galaxies
Multiple Star SystemsBinary stars – star systems with two starsEclipsing binary – system where one star periodically blocks light from another
Star ClustersOpen cluster – loose disorganized appearance and contains less than a few thousand starsGlobular cluster – large grouping of older stars that is round and densely packed with stars, sometimes millions
Three types• Spiral – bulge in the middle and arms that spiral out like a pinwheel an example is the Milky Way• Elliptical – round or flattened balls• Irregular – no shape, usually contain bright, young stars
Galaxies – huge group of single stars, star systems, star clusters, dust, and gas bound by gravity
Additional InformationQuasars – enormously bright object that looks like star many billion light years awayUniverse – all of space and everything in itCosmic Background Radiation – mysterious glow that is thermal energy left over from the big bang
– Dark Matter – matter that does not give off electromagnetic radiation
– Dark Energy – mysterious new force causing the expansion of the universe to accelerate
***Most of the universe is made of dark matter and dark energy***