From the fires of our Sun's birth, twin planets emerged: Venus and Earth. Nature draped one world in the greens and blues of life, while enveloping the other in acid clouds... high heat... and volcanic flows. Why did Venus take such a disastrous turn?
How solar eruptions could threaten our high-tech society. Follow powerful, twisting magnetic fields as they carry clouds of electrified gas in our directions, and threaten to zap our increasingly complex electronic power and communications infrastructure.
Did Mars long ago develop far enough for life to arise? If so, does anything still live within Mars' dusty plains, beneath its ice caps, or somewhere underground? Find out how a violent impact may have ruined Mars' chances to become Earth-like.
On the first of July 2004, the Cassini probe entered the orbit of Saturn and soon began to compile what has become one of the greatest photographic collections of all time. Here is a giant gas planet, surrounded by colorful rings, guarded by a diverse collection of moons, and millions of tiny moo...