The first exoplanets discovered were two rocky objects orbiting a pulsar in the constellation Virgo, announced in 1992 by Aleksander Wolszczan and Dale Frail. As of 2007, 242 exoplanets are known, with at least 10% of Sun-like stars suspected to have planets. PSR B1257+12B and PSR B1257+12C are about four times the mass of Earth […]