Scientists have long assumed that, like rocky planets such as Earth, sub-Neptunes begin with molten magma oceans. Their thick ...

Meanwhile, the water could cycle upward, possibly escaping through volcanic activity or forming oceans if the surface eventually cools enough. These processes might not be unique to Sub-Neptunes. Any ...

Triton was discovered in 1846 by the British astronomer William Lassell, but much about Neptune’s largest moon still remains a mystery. A flyby by NASA's Voyager 2 spacecraft in 1989 offered a quick ...

For years, scientists believed most mini-Neptunes were covered by vast oceans of molten rock—essentially entire planets made ...

"Water on planets is much more limited than previously believed." Sub-Neptune planets, often billed as possible "water worlds," may be more desert than deep sea, according to a new study. For years, ...

Our galaxy's most abundant type of planet could be rich in liquid water due to formative interactions between magma oceans and primitive atmospheres during their early years, according to new research ...

In the beginning, when planets were newborn, they glowed like furnaces, vast oceans of molten rock wrapped in heavy blankets of gas. For a long time, scientists believed those fiery worlds were too ...