Thread by @MesMitch

An Alien Comet From Another Star Is Soaring Through Our Solar System

sciencespies.com/news/an-alien-…

Something strange is sailing toward us. Something small and cold and extraordinarily fast. No one knows where it came from, or where it is going. But it’s not from around here. This is an interstellar comet – an ancient ball of ice and gas and dust

, formed on the frozen outskirts of a distant star, which some lucky quirk of gravity has tossed into our path. To astronomers, the comet is a care package from the cosmos – a piece of a place they will never be able to visit, a key to all the worlds they cannot directly observe.

It is only the second interstellar interloper scientists have seen in our solar system. And it’s the first one they’ve been able to get a good look at. By tracking the comet’s movement, measuring its composition and monitoring its

behaviour, researchers are seeking clues about the place it came from and the space it crossed to get here. They have already found a carbon-based molecule and possibly water – two familiar chemicals in such an alien object.

As the Sun sinks behind the Tennessee mountains, and stars wink into view, astronomer Doug Durig climbs onto the rooftop of his observatory, powers up his three telescopes and angles them skyward.