Alien craft or natural object? The most mysterious comet, Atlas, is approaching Earth
Initial estimates placed the comet’s diameter at about 11 kilometers (7 miles). However, subsequent data from the Hubble Space Telescope indicated that 3I/ATLAS is likely closer to the maximum size of 5.6 kilometers (3.5 miles). In any case, it is likely the largest interstellar object ever observed.
A Brief Excursion into the History of Ufology and the Secrets of the Pentagon
“Close Encounters of the First Kind” referred to UFOs seen at close enough range to discern some details. In “Close Encounters of the Second Kind,” the UFO exerted physical influence, such as burning trees, frightening animals, or causing car engines to stall. In “Close Encounters of the Third Kind,” witnesses reported seeing people inside or near the UFO.