For generations, artists and science-fiction writers have imagined alien landscapes beneath twin sunsets. The image became iconic in popular culture long before astronomers confirmed that planets ...

Imagine peeling back miles of frozen white and revealing valleys, rivers, and mountains that haven't seen sunlight in tens of millions of years. Long before Antarctica froze over, rivers carved ...

Saturn’s moon Titan looks very much like Earth from space, with rivers, lakes, and seas filled by rain tumbling through a thick atmosphere. While these landscapes may look familiar, they are composed ...