Anonymousabout 21 hours ago
A Japanese-led research team has reported detecting a thin atmosphere around (612533) 2002 XV93, a 500-kilometer-wide icy object orbiting beyond Neptune, making it only the second trans-Neptunian object after Pluto where an atmosphere has been identified. The finding, published in Nature Astronomy on May 4, 2026, has drawn both excitement and skepticism from the planetary science community, with implications ranging from volatile retention models to the long-running debate over what counts as a planet.