Hubble discovers mysterious dark storm on Neptune: NASA

WASHINGTON: The Hubble Space Telescope has uncovered a new mysterious dark storm on Neptune and provided a fresh look at a longlived storm circling around the north polar region on Uranus, NASA said. Like Earth, Uranus and Neptune have seasons, which likely drive some of the features in their atmospheres, says the US space agency. Their seasons are much longer than on our planet, spanning decades, NASA said in a statement. The storm appeared during the planet's southern summer, the fourth and latest dark vortex captured by Hubble since 1993. Two other dark storms were discovered by the Voyager 2 spacecraft in 1989 as it flew by the remote planet, NASA said.