Fifth planet (hypothetical) orbit as defined by the Titius–Bode law. Between 1845 and 1851, eleven additional asteroids were discovered and Jupiter had become the twentieth planet. At this point, astronomers began to classify asteroids as minor planets. Following the reclassification of the asteroids in their own group, Jupiter became the fifth planet once again. With the redefinition of the term "planet" in 2006, Ceres is now considered a dwarf planet. The disruption theory suggests that a planet which was positioned between Mars and Jupiter was destroyed, resulting in the asteroid belt between these planets. Scientists in the 20th century dubbed this hypothetical planet
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