A white dwarf is what remains after a medium-mass star has exhausted its nuclear fuel and shed its outer layers. The core - no longer generating energy through fusion, no longer expanding against the...
A white dwarf is what remains after a medium-mass star has exhausted its nuclear fuel and shed its outer layers.
The core - no longer generating energy through fusion, no longer expanding against the compression of gravity - contracts to a area roughly the size of the Earth but with a mass comparable to the Sun's.
The density is amazing: a teaspoon of white dwarf material would weigh approximately five tons on Earth.
Here is the thing most people miss.The white dwarf is incredibly dense, incredibly stable, and incredibly long-lived.