3I/ATLAS sent a message to Earth after it passed its perihelion. Scientists found the interstellar object brightened fivefold but showed no comet tail, raising new questions about its nature and possible artificial origin.
Source: https://economictimes.indiatimes.com/news/international/us/3i/atlas-sent-a-message-to-earth-interstellar-object-has-no-tail-and-brightened-fivefold-after-perihelion-heres-most-shocking-claims-speculations-and-10-strange-facts-about-comet-nasa-minor-planet-center-harvard-scientist-avi-loeb-r-naves-observatory-in-spain/articleshow/125121047.cms