A star's death method is determined by its mass. A star with a mass under 4.2 times the mass of the Sun (called the Chandrasekhar limit after the University of Michigan astronomer who first determined it) will wind up a white dwarf and ultimately burn out as a heavy but small, dense object.
<span>More massive stars will become white dwarfs, neutron stars, novas, supernovas, black holes, depending on a variety of factors, including mass and the presence of a close stellar binary companion</span>
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The growth of interregional trade in luxury goods was encouraged by significant innovations in previously existing transportation and commercial technologies, including more sophisticated caravan organization; use of the compass, astrolabe, and larger ship designs in sea travel
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