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The Planets: Inner Worlds
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Season 46
Episode 13
Mars was once a blue water-world studded with active volcanoes. But when its magnetic...
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Season 46
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Fifty years after humans first set foot on the Moon, new scientific discoveries are...
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NOVA

The Planets: Inner Worlds

Season: 46
Eps: 12

The rocky planets—Mercury, Venus, Earth and Mars—were born of similar material around the same time. Yet only one of them supports life. Were Earth's neighbors always so extreme? And is there somewhere else in the solar system life might flourish?

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