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
The Man from Planet X 11:00pm to rescue them. He sneaks up to the alien ship and learns from Mears that the spaceman intends to use its ship as a wireless relay station in advance of an invasion coming from the approaching planet, which we also learn is a dying world. Lawrence orders the enthralled villagers to leave and attacks the alien, shutting off its breathing apparatus, then escapes with Enid and the professor. Mears, however, returns to the spaceship and is killed when the military opens fire and destroys it, shortly before the planet is nearest Earth. No invasion happens and the mysterious Planet