The Planets: Inner Worlds
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?
Episode Clips
Five Facts About Hot, Volcanic Venus
Our next door neighbor is most like Earth in terms of size and mass.
Behind the Scenes: The Making of "The Planets"
See the work that went into creating some of the animations in "The Planets."
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