There are very special cases, when the sky is very clear and exceptionally transparent, that a green flash can be glimpsed just as the very topmost part of the sun is rising or setting.

A long-period comet that hasn’t been near Earth for 50,000 years is now visible with the naked eye. The comet known as C/2022 E3 (ZTF) is a dazzling green color chiefly because of the presence ...

The green comet has not been seen for 50,000 years. You may be able to spot the comet in a clear, moonless sky -- especially with binoculars or a telescope.

A recently discovered comet will soon swing by Earth for the first time in 50,000 years. The green comet will make its closest approach between February 1 and 2.

Comet C/2022 E3 (ZTF) last passed Earth 50,000 years ago. If you're looking at the night skies Wednesday and make out a tiny green light in the sky, don't panic, aliens haven't landed. A rare ...

If we discover a green-tinted world, it could mean that early photosynthetic organisms are thriving there, just like they once did on ancient Earth. Earth’s green oceans may be long gone, but ...