When the Kinks' Ray Davies penned the tune 'Last of the Steam-Powered Trains,' the vanishing locomotives stood as nostalgic symbols of a simpler English life. But for a paleontologist, the replacement ...

Scientists are unraveling the mysteries of "steam worlds"—exoplanets known as sub-Neptunes that are rich in water but orbit so close to their stars that their surfaces are shrouded in thick ...

Animation of a steam world’s evolution from formation to very old age (100 million years to 20 billion years). The interior is initially hot, and cools over time. How fast the planet cools is ...