
The Planets: Inner Worlds
The rocky planets have similar origins, but only one supports life. Was it always this way?


The rocky planets have similar origins, but only one supports life. Was it always this way?

Before it was a dry planet, Mars was a wet world that may have hosted life.

Jupiter's massive gravitational force has made it both a wrecking ball and a protector of Earth.

NASA's Cassini reveals the mysteries of Saturn's rings—and new hope for life on one of its moons.

Beyond the bizarre, icy worlds of Uranus and Neptune, Pluto dazzles with its mysterious ocean.
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