Astronomers detect signs of an atmosphere stripped from a planet in a giant impact

A team has discovered evidence of a giant impact in the nearby HD 17255 star system, in which an Earth-sized terrestrial planet and a smaller impactor likely collided at least 200,000 years ago, stripping off part of one planet's atmosphere.

source https://www.sciencedaily.com/releases/2021/10/211020135916.htm