The Pulsar Planets
Because of the exquisitely accurate timing
signal provided by pulsars, the first extrasolar planets were discovered around a pulsar, and are
the only terrestrial extrasolar planets known.
Of course,
they aren’t exactly Earth-like, given that they must have been formed
after the supernova explosion, and their “sun” is a tiny dim object that emits extremely
hard radiation and energetic particles…