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Star Systems and Galaxies. Multiple Star Systems Binary stars – star systems with two stars Eclipsing binary – system where one star periodically blocks light from another.
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Star Systems and Galaxies Multiple Star Systems Binary stars – star systems with two stars Eclipsing 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
Galaxies – huge group of single stars, star systems, star clusters, dust, and gas bound by gravity 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
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***
