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danazol buy uk When a once-massive star explodes as a supernova, it creates either a black hole or a neutron star, a condensed, rapidly-spinning cinder with extraordinary gravitational pull. Most neutron stars, which pack the mass of about 1.4 suns into a ball just 20 or so kilometers in diameter, exist in isolation. "In the Milky Way, there are only about a hundred other neutron stars we are aware of that have held onto their companion stars," Heinz notes.