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 ...

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

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

"It shows that Makemake is not an inactive remnant of the outer solar system, but a dynamic body where methane ice is still ...

Scientists have discovered methane gas on the dwarf planet Makemake, a finding that has surprised astronomers studying the outer solar system.

Astronomers have discovered 2017 OF21, a distant dwarf planet candidate located about 90 times farther from the Sun than Earth, making it more than twice as far as Pluto. With a highly elongated orbit ...

In the 30 years since the discovery of 51 Pegasi b, more than 6,000 planets outside our Solar System have been catalogued.

Astronomers have found new evidence, revealing the existence of an unseen and mysterious planet that could be hidden in the ...

It started, as many cosmic enigmas do, with a dim dot of light on a Hubble Space Telescope photo the sort that professional ...

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 ...