A new study suggests yet another theory for a possible extra planet in our solar system, likely of a size between Mercury and ...

New observations suggest that the dwarf planet Makemake is surrounded by faintly glowing methane gas. Scientists are unsure ...

The solar system is a grand cosmic stage where each planet and moon plays a unique role in a story billions of years in the making. From Mercury’s shrinking surface and Venus’s runaway greenhouse ...

Amir Siraj and team propose Planet Y, a possible unseen planet influencing Kuiper Belt object orbits. Vera C. Rubin ...

Astronomers have discovered fresh evidence suggesting the possible existence of an unseen planet in the far reaches of our ...

Our solar system is a smashing success. A new study suggests that from its earliest period—even before the last of its ...

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

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 ...

New research suggests that planets outside our solar system contain far less surface water than scientists once believed.

More than 50 times further from the Sun than Earth, the tiny dwarf planet Makemake is one of the last places you'd expect to ...

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

Phosphorus is one of six key elements necessary for life on Earth. When combined with hydrogen, phosphorus forms the molecule ...