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fusion, core contraction Ash of one fusion becomes fuel for the next A 25 MSun star will fuse over solar mass of silicon in iron in 1 day fuse oxygen in 6 months Finally silicon produce iron nuclear reaction with iron doesn’t produce iron it consume iron pressure no longer resist gravity( Whole Process stars very big become red no change in brightness) then Nuclear reactions cease at the center of the star's core collapses in less than 1/10th of a second Triggers an intensely energetic rebound shatter in supernova 10000times brighter(AD1054The CrabNebulasupernovaremnant 1006 1572tycho 1604kepler 185 386 393 181)The atoms we are made of were formed within the cores and supernovae of massive stars Your body, your phone, your computer-- all from the death of stars! All the elements heavier than iron (gold, silver, lead, etc.) were created in supernova.Star’s core remnant-neutron star(1.5-2Msun entirely neutron) or blackhole nothing escape OpenGroup of hundreds of stars Irregularly shaped grouping of stars Contains bright blue stars Located in the arms of the MilkyWay and other spiral galaxies Composed of young stars that recently formed in the disks of galaxies Continues to form in the arms of spiral galaxies, including the Milkyway GlobularGroup of tens of thousands to hundreds of thousands of stars Highly symmetrical ball of stars Composed of old stars that formed when the universe was younger Located in thehalo or bulge of a galaxy No longer forming in our galaxy, the Milky WayFrequently contains bright red giant stars Both Stars in the cluster are at the same distance from Earth.All of its stars are the same age, having formed from the same cloud of gas and dust.Group of stars held together by mutual gravitational attraction The star colors in a cluster indicate the age of the cluster. Orbits the center of a galaxy Open loose thousand Globular dense hundred of thousand We can determine the age of a star cluster by looking at the highest mass stars that are just about to leave the main sequencedegenerate matter compressed until no room for electron Electrons rushing to fill the energy levels (they like the lower levels)causes an electron degeneracy pressure electron resist gravity if 8-25 neutron 25more blackhole Neutronsolid crust 1milenterior liquid neutron mass1.5MSNeutron against gravityIn a neutron star, protons and electrons merge into neutrons. When neutrons run out of room, they resist further collapse. Pulsar remnant of supernova-spining neutron starWhen the stellar core collapsed, the rotation rate and magnetic field strength both increased A neutron star is about the same size as a small city, with 500,000 times the mass of the Earth! white dwarf 2000 Mearth same size life span 1.Main Sequence 2.Red Supergiant 3.Blue Supergiant 4.Red Supergiant II 5.Supernova! 6.Neutron star or black hole Black Hole Event horizon boundary escape speed of light Singularity infinitely tiny dense point For every 1 MSun of mass, a black hole’s event horizon has a radius of 3 km The greater the mass,