The prospect of life on Mars – Earth’s planetary next-door neighbour, an alien world that betrays tantalising hints of a watery past – has bewitched humanity for centuries. From the ‘canals’ seen by a

There’s a reason why Earth has seasons – and it’s about being totally tilted.

Scientists distinguish between weight and mass, which may seem pedantic until you see what happens on a world where gravity is radically different to Earth’s

In Greece, beachgoers lie on the sand while ...

Ten years ago, Pluto emerged from the gloom at the Solar System’s ragged edge – and a new world came in from the cold. Five billion kilometres (3 billion miles) from Earth, on 14 July 2015, NASA’s pia

20 amazing answers t o curious