Colliding exoplanets around a distant star. The explosion was first seen by NEOWISE and the dimming was caught by @lco - forming a new astronomical object - a "Synestia"!
https://www.theguardian.com/science/2023/oct/11/afterglow-cataclysmic-collision-between-two-planets-seen-for-first-time
I was very pleased to be (a very small) part of this amazing work.