Hope

Oh wouldn't you like to go to a planet that was a sun, mine in a planet that was once a sun, die on a planet that was once a sun. / Its companion nearly killed it, it's core became a diamond, and now it's a planet that was once a sun

— tradiational mining song

Hope is a gas giant planet with a large diamond core. It orbits a millisecond pulsar and is known to Humans as PSR J1719-1438 b.
It orbits its star at a distance less than the radius of Sol, which exposes it to a lot of radiation. Hence,