The Origins of Uranium

Uranium is special because although it's thick and chubby with neutrons in the form of Uranium-238, it stays with us for some time. There are two theories about where much of Earth's Uranium comes from. One is a tiny amount of Uranium that's present in something like our Sun which is dominated by hydrogen fusion reactions. The other is when neutron stars smashing together act as factories for the super heavy elements of which Uranium 235 and 238 would have been spewed out into the local areas of space.