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
Solar Road and Soil Regeneration Hybrid Energy System greater the rate of heat transfer. Therefore, the most efficient system will be one that consists of an extensive network of smaller diameter pipes. This process essentially treats the solar road as a heat source and the soil as a heat sink. SRSRHES technology can be applied to most types of roadway as well as most environmental conditions, however, the operation efficiency is dependent on several factors. Solar radiation hits the equatorial regions of the Earth more directly than polar regions due to the spherical nature of the planet. An SRSRHES installed in polar regions will convert less solar energy