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
Third from the Sun called "Earth". Todd VanDerWerff of "The A.V. Club" rated it A and called the twist "justifiably famous". The episode contains an anomaly: the planet revealed as being Earth is described as being in another solar system, "11 million miles" away. The next closest solar system to our sun is actually 25.7 trillion miles away. Third from the Sun "Third from the Sun" is episode 14 of the American television anthology series "The Twilight Zone". It is based on a short story of the same name by Richard Matheson which first appeared in the first issue of the magazine "Galaxy Science