Earth, Mars, Jupiter, Saturn, Uranus and Neptune. But in recent years, astronomers have proposed that a ninth world, ...

They argued that the strange orbits of several transNeptunian objects could only be explained by a planet about ten times the mass of Earth. Based on current models the potential ninth planet is ...

An elusive Earth-like planet in our solar system could ... For more than 70 years, Pluto was classed as the ninth planet but that changed in 2006, when the International Astronomical Union ...

Pluto was once called the ninth planet, but in 2006, scientists changed its status to a dwarf planet. A planet must clear its orbit of other objects, but Pluto shares its space with many small icy ...

Detecting these planets is challenging due to their vast distance from Earth. Raymond stated it would be extremely hard to spot an Oort Cloud planet. Malena Rice, an astronomer at MIT, suggested ...