Interstellar Comet Shows Alien Activity

This visitor, 3I/ATLAS, is only the third interstellar object ever detected, following the discoveries of 1I/ʻOumuamua in 2017 and 2I/Borisov in 2019. It was first spotted on July 1, 2025, by the Asteroid Terrestrial-impact Last Alert System (ATLAS), a NASA-funded planetary defense network in Chile. The comet is traveling on a hyperbolic trajectory at immense speed, reaching about 153,000 miles per hour (246,000 km/h) at its closest approach to the Sun. This path confirms it is not bound by our sun's gravity and is merely passing through before heading back into interstellar space. Unlike the first interstellar visitor, 'Oumuamua, scientists have confirmed 3I/ATLAS is an active comet with a visible coma—a cloud of gas and dust. Its nucleus is estimated to be between 1,400 feet (440 meters) and 3.5 miles (5.6 kilometers) in diameter. Observations by the James Webb Space Telescope revealed a surprising chemical makeup, very different from comets native to our solar system. The comet is unusually rich in carbon dioxide, with about eight times more CO2 than water, and also contains abundant nickel but little iron. The Juice spacecraft's observation on November 6, 2025, was opportune, as the craft is actually on a nearly eight-year journey to Jupiter to study its icy moons. Its deep-space vantage point allowed for clearer views of the comet after it had passed the sun and was becoming difficult for Earth-based telescopes to see. While the "alien spaceship" moniker is speculative, the scientific consensus is that 3I/ATLAS is a natural object. Its trajectory shows no signs of artificial course changes, and its composition offers a rare chance to study the building blocks of a planetary system different from our own.