Comet C/2025 R3 may reach rare brightness levels, offering a spectacular (and unpredictable) show before sunrise.

The breakup was caused by the extreme conditions near the Sun; during its latest approach, C/2025 K1 flew as close as 0.334 ...

Atomic nickel vapor was observed to exist in the environs of comet 3I/ATLAS at 3.88 AU, far away, when compared to the Sun, ...

That community recently came together to observe Comet C/2023 A3 (Tsuchinshan-ATLAS) as it passed through the night sky. Near ...

King William should have seen his demise coming, according to the medieval omen experts of his era. Halley’s comet appeared ...

Comet C/2025 K1 (ATLAS) fragmented after its October 2025 solar approach, with telescope observations documenting multiple ...

The interstellar visitor may still have a few things to tell us before it leaves our solar system.

The international team of astronomers reports that all of the types of ice in the comet appear to be sublimating. This is the phase change where a solid turns into a gas, skipping the liquid phase.

The British astronomer and mathematician Edmond Halley was not, after all, the first to understand the cycle of the comet ...