ATLAS

"The alien comet 3I/ATLAS is roughly 7 miles (11.2 kilometers) wide, making it the largest interstellar object ever spotted, according to newly revealed photos from the Vera C. Rubin Observatory."https://www.livescience.com/space/comets/3i-atlas-is-7-miles-wide-the-largest-interstellar-object-ever-seen-new-photos-from-vera-c-rubin-observatory-reveal