The Planets: Inner Worlds
Season 46 Episode 12 | 53m 54s
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?
Expires: 09/11/19Video has closed captioning.
Problems Playing Video?
Are we alone—and if not, what might the inhabitants of far-flung worlds look like?
Hunt for clues in the universes to answer one of humanity’s biggest questions.
There may be a ninth planet at the edge of our solar system — it’s not Pluto and it’s not
What makes Venus's next door neighbor unique?