There are a couple of ways that scientists can date planets, so which planets formed first in our solar system?
A new study has proposed the existence of Planet Y, an alternative Planet Nine candidate that is smaller and closer to Earth ...
Since Pluto was relegated to dwarf planet status, almost everyone has agreed that there are eight planets in our solar system ...
Amir Siraj and team propose Planet Y, a possible unseen planet influencing Kuiper Belt object orbits. Vera C. Rubin ...
A new study suggests yet another theory for a possible extra planet in our solar system, likely of a size between Mercury and ...
From lava worlds to gas giants, NASA says the variety of these worlds is staggering—and that signs of a further 8,000 distant ...
Uranus and Neptune are the two furthest planets in the Solar System and have been visited only once by human spacecraft – by ...
Pluto's unusual eccentricity and tilt is likely due to its interactions with neighboring Neptune and other giant planets, ...
More than 2 billion kilometers farther from the sun than Pluto, a frigid world named Makemake sports the most distant gas ever seen in our solar system, new observations reveal. “By surprise, we found ...
Astronomers have discovered new evidence that suggests the possibility of an unknown planet in our solar system's farthest reaches. The study, published in the Monthly Notices of the Royal ...
(CNN) — The search for an unknown planet in our solar system has inspired astronomers for more than a century. Now, a recent study suggests a potential new candidate, which the paper’s authors have ...