Add Yahoo as a preferred source to see more of our stories on Google. When you buy through links on our articles, Future and its syndication partners may earn a commission. Neptune (left) and Uranus ...

WASHINGTON — Frigid and far-flung Neptune, our solar system’s outermost planet, is adding to its reputation as an enigmatic world, with astronomers puzzled by a surprising drop in its atmospheric ...

A team of researchers from the University of Zurich and the NCCR PlanetS is challenging our understanding of the solar system planets' interior. The composition of Uranus and Neptune, the two ...

In 1989, Voyager 2 became the first and only spacecraft to ever fly by Neptune, and images from that mission famously show a planet that's a deep azure color. But in reality, Neptune is far more of a ...