Methuselah
PSR B1620-26 b, nicknamed Methuselah, is the oldest planet that’s ever been discovered. This incredible world was first formed nearly 13 billion years ago, and it has outlived both of its parent stars, which have long since burned out. Methuselah is so peculiar that astronomers first assumed it was a failed star itself. Then they realized, no, it’s just very, very long in the tooth.