Fifth planet (hypothetical) Fifth planet (hypothetical) In the history of astronomy, a handful of Solar System bodies have been counted as the fifth planet from the Sun. Under the present definition of a planet, Jupiter is counted as the fifth. There are three main ideas regarding hypothetical planets between Mars and Jupiter. During the early 19th century, as asteroids were discovered, they were considered planets. Jupiter became the sixth planet with the discovery of Ceres in 1801. Soon, three more asteroids, Pallas (1802), Juno (1804), and Vesta (1807) were discovered. They were counted as separate planets, despite the fact that they shared an
Planet of the Spiders Planet of the Spiders Planet of the Spiders is the fifth and final serial of the 11th season of the British science fiction television series "Doctor Who", which was first broadcast in six weekly parts on BBC1 from 4 May to 8 June 1974. It was Jon Pertwee's last serial as the Third Doctor, and marks the first, uncredited appearance of Tom Baker as the Fourth Doctor. It marks the last regular appearance of Mike Yates. This serial introduces the term "regeneration". The serial is set in England and on the planet Metebelis Three. In the serial, the fired salesman