The search for an unknown planet in our solar system has inspired astronomers for more than a century. Now, a recent study ...

Astronomers using the Hubble Space Telescope have observed a white dwarf – a highly compact stellar ember – that appears to have gobbled up an icy world akin to the dwarf planet Pluto, a finding with ...

Astronomers have discovered new evidence that suggests the possibility of an unknown planet in our solar system's farthest ...

A recent study introduces a potential new candidate, dubbed Planet Y, inferred from the tilted orbits of distant objects in the Kuiper Belt.