Fifth planet (hypothetical) into the Sun. Unlike the Disruption Theory's fifth planet, "Planet V" is not credited with creating the asteroid belt. The concept of a fifth planet which had been destroyed to make the asteroid belt, as in the Disruption Theory, has been a popular one in fiction. 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,
The Tenth Planet "Castrovalva". The story was released on DVD on 14 October 2013, with the missing fourth episode animated along with additional extra features including the original reconstruction of episode four from the 2000 VHS Release included as an extra and a special "Frozen Out" documentary on the making of the story. The "Regenerations" box set, released on 24 June 2013, contains "The Tenth Planet" (including the newly animated fourth episode). The serial was released with no special features. The soundtracks for "The Tenth Planet" and "The Invasion", put together from fan-made recordings, along with a bonus disc, "The Origins of the