Comet A3 hasn't been past Earth since the Neanderthals. Your last chance to see it is approaching fast. Here's where and how ...

It has long been assumed that the gases of a comet tail are pushed away from the comet by the pressure of light from the sun. It now appears that many tails are caused by a wind of charged ...

In Millour's photo, you can see that tail blowing out, away from the sun just after sunset, from the comet's head (called the nucleus) on the horizon. The solar wind also blows ions of the comet ...

The “comet of the century” that was likely last seen by the Neanderthals seemed to develop a physics-defying second tail as ...

Within this comet, digital health literacy finds its place in the particles of that tail, in that bright reflection that makes digital health visible, comprehensible and accessible. Moving away ...

The brightest object left of center is the moon, while the faint, wispy tail of comet C/2024 G3 (ATLAS) can be seen at the far left, just to the right of one of the observatory's telescopes.

Why it's so special: Nicknamed the "Great Comet of 2025," Comet C/2024 G3 (ATLAS ... is composed of gases that glow from ionization. This tail points in a different direction than the first ...