Earth-sized methane storm spotted on Neptune
US-based astronomers have observed a storm of methane clouds about the size of Earth near Neptuneâs equator, a region where no bright cloud had been seen before. A high-pressure, vortex system anchored in Neptune's atmosphere may be causing the colossal cloud cover, said a scientist. Notably, NASA's Hubble Space Telescope has previously spotted storms on Neptune, towards the pole regions.