A family of extinct kangaroos, three times bigger than living species, probably walked rather than hopped, according to a detailed study of their bones.

A Nasa spacecraft has provided the first optical images of ice within permanently shadowed craters on the planet Mercury.

The internal structure of Saturn's moon Mimas is either irregularly shaped or awash with water, according to a new study of its tell-tale wobbling movements.

Smart meters widely used in Spain can be hacked to cut power bills, two security researchers find.

The presence of carnivores, which control herbivore numbers, helps plants without thorny defences thrive, a study of life on the savannah reveals.