Planet the Sun: Jupiter is the largest, at 318 Earth masses, whereas Mercury is the smallest, at 0.055 Earth masses. The planets of the Solar System can be divided into categories based on their composition: An exoplanet (extrasolar planet) is a planet outside the Solar System. In early 1992, radio astronomers Aleksander Wolszczan and Dale Frail announced the discovery of two planets orbiting the pulsar PSR 1257+12. This discovery was confirmed, and is generally considered to be the first definitive detection of exoplanets. These pulsar planets are believed to have formed from the unusual remnants of the supernova that produced the
One of Our Planets Is Missing One of Our Planets Is Missing "One of Our Planets Is Missing" is the third episode of the first season of the animated American science fiction television series "". It first aired in the NBC Saturday morning lineup on September 22, 1973, and was written by veteran "" director Marc Daniels. In this episode, the "Enterprise" must contend with a massive space cloud that eats planets, now targeting a Federation colony of over 82 million. On stardate 5371.3, the "Enterprise" encounters a giant cloud that consumes planets that lie in its path. They determine it is heading for Mantilles, home