A pair of once-in-a-lifetime comets are rocketing through our skies right now, and it's a rare treat because they won't be back for hundreds of years. The comets, C/2025 A6 (Lemmon) and C/2025 R2 (SWAN),

Harvard scientist Avi Loeb has revealed that if comet 3I/ATLAS were an 'alien spaceship', it will be reaching Earth tomorrow (October 29).

Astronomer Gianluca Masi and his Virtual Telescope Project will host a special livestream on Oct. 24 beginning at 1:30 p.m. EDT (1730 GMT) to watch as both comets make a close pass to Earth, making them well placed for observations.

Comet Lemmon (C/2025 A4) will make its closest approach to Earth on November 8th, and is currently visible to the naked eye in dark locations away from light pollution.

Brooks, which visits the Earth roughly every 71 years, was spotted releasing intriguing radio signals last year.

A NASA-backed planetary defense group has reportedly begun efforts to pinpoint comet 3I/ATLAS after it was observed emitting an alloy not seen in nature and exhibiting other strange behaviors.

A rare green comet known as C/2025 A6 (Lemmon) passes Earth for the first time in over 1,300 years, National Geographic said.