An alien landscape? One of the landmarks when Earth is seen from space is the thirty-mile-wide Richat Structure, or Eye of the Sahara, found in Mauritania (Figure I.1). Some thought the Richat ...

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 ...