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
Escape from the Planet of the Apes the second. A new character of Dr. Milo is introduced played by actor Sal Mineo, who hoped his career would gain from the new project much as McDowall's career had from participating in the first film. Charlton Heston, star of the first film and supporting actor in the second, appears in this third installment only in two brief flashback sequences. Despite "Beneath the Planet of the Apes" ending in a way that seemed to prevent the series from continuing forward, 20th Century Fox still wanted a sequel. Roddy McDowell, in the franchise documentary "Behind the Planet of the Apes", stated