Harvard astrophysicist Avi Loeb co-authored a July research paper speculating about whether the comet 3I/ATLAS is in fact ...

Evidence that rocky planets beyond Jupiter formed as rapidly, and at the same time, as the inner planets could transform our ...

New discoveries of objects in the Kuiper Belt have also presented challenges for the Planet Nine theory. The latest is known ...

The celestial body's unusual orbit “implies that something extraordinary occurred" in the early days of the solar system—and ...

Learn about cryovolcanism, which shapes the surface of icy moons in the outer Solar System by releasing water that ...

"It is possible that a planet once existed in the solar system but was later ejected, causing the unusual orbits we see today ...

From Mercury to Pluto (and maybe even Planet Nine), here are some of 2023's most intriguing discoveries about the planets, moons and other bodies in our solar system.

Astronomers think small space rocks from beyond our solar system routinely strike Earth—but proving it isn’t easy ...

The astronomers observed hot minerals just beginning to solidify – the first specks of planet-forming material, the astronomers said. A gaseous disk surrounding the young star is the first stages of ...

While astronomers have previously seen young discs that contain newborn, massive, Jupiter-like planets, McClure says, “we’ve ...

Researchers suspect that two meteorites found in the Sahara Desert in 2023 may originally have come from Mercury, which would ...