Was there a planet between Jupiter and Mars?
It is possible that a planet between Jupiter and Mars was destroyed in an impact with another large object. What object caused this break up into fragments creating the asteroid belt? Was it a planet? Was it a planet named Niburu linked to the close of the Mayan calendar? The story began in 1976, when Zecharia Sitchin wrote "The Twelfth Planet," a book which used Stitchin's own unique translation of Sumerian cuneiform to identify a planet, Nibiru, orbiting the sun every 3,600 years. Several years later, Nancy Lieder, a self-described psychic, announced that the aliens she claimed to channel had warned her this planet would collide with Earth in 2003. After a collision-free year, the date was moved back to 2012, where it was linked to the close of the Mayan long-count period. The planet has not arrived, but with an orbit of 3,600 years perhaps it is returning and with advanced telescopes we should see it soon.
Google & Wikipedia wrote:
When Comet Elenin appeared in 2011, many were concerned that it was the mysterious planet in disguise, despite the fact that planets and comets appear very different under a telescope. (A comet has a gas atmosphere, called a coma, and a tail, while a planet does not.)
But instead of slamming into the Earth, the comet strayed too close to the sun and broke into pieces. The leftover fragments will continue on their path to the outer solar system for the next 12,000 years, still bits of comet and not a more cohesive planet.
A supposed ninth planet after Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus and Neptune but excluding Pluto is supposed to exist. Pluto (minor-planet designation: 134340 Pluto) is a dwarf planet in the Kuiper belt, a ring of bodies beyond the orbit of Neptune. It was the first and the largest Kuiper belt object to be discovered. After Pluto was discovered in 1930, it was declared to be the ninth planet from the Sun. Beginning in the 1990s, its status as a planet was questioned following the discovery of several objects of similar size in the Kuiper belt and the scattered disc, including the dwarf planet Eris. This led the International Astronomical Union (IAU) in 2006 to formally define the term "planet"— excluding Pluto and reclassifying it as a dwarf planet.
Planet Nine is a hypothetical planet in the outer region of the Solar System. Its gravitational effects could explain the unlikely clustering of orbits for a group of extreme trans-Neptunian objects (ETNOs), bodies beyond Neptune that orbit the Sun at distances averaging more than 250 times that of the Earth. These ETNOs tend to make their closest approaches to the Sun in one sector, and their orbits are similarly tilted. These alignments suggest that an undiscovered planet may be shepherding the orbits of the most distant known Solar System objects. Nonetheless, some astronomers question the idea that the hypothetical planet exists and instead assert that the clustering of the ETNOs orbits is due to observing biases, resulting from the difficulty of discovering and tracking these objects during much of the year.
Based on earlier considerations, this hypothetical super-Earth-sized planet would have had a predicted mass of five to ten times that of the Earth, and an elongated orbit 400 to 800 times as far from the Sun as the Earth. The orbit estimation was refined in 2021, resulting in a somewhat smaller semimajor axis of 380+140-80 AU. This was more recently updated to 460 +160-100 AU. Konstantin Batygin and Michael E. Brown suggested that Planet Nine could be the core of a giant planet that was ejected from its original orbit by Jupiter during the genesis of the Solar System. Others proposed that the planet was captured from another star, was once a rogue planet, or that it formed on a distant orbit and was pulled into an eccentric orbit by a passing star.
As of October 2021, no observation of Planet Nine had been announced.
Find this planet or disprove it.