Primordial black holes are one explanation for dark matter, although it's not widely accepted. These black holes would have formed at the beginning of the Universe and would be at least the mass of a medium-sized asteroid. These black holes may have fallen into the stars if they are out there. These low-mass black holes would emit Hawking radiation, contributing to the star's radiation pressure. Is there a way we could know if there's a black hole inside the Sun?

Elements heavier than iron, like gold or platinum, were created when massive stars died or through colliding neutron stars. Some of our heavy elements on Earth resulted from an even heavier element decaying through fission. Astronomers studied several stars and found elements that must have been formed through the death of previous generations of stars and the fission of their matter. Some of these elements would have been more than an atomic mass of 260.