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Visit the planet most like Earth. There is a discussion of what life on Mars would be like and about the life forms that could've evolved there.
Episodes
1Secrets of the Sun 2Mars: The Red Planet 3The End of the Earth: Deep Space Threats to our Planet 4Jupiter: The Giant Planet 5The Moon 6Spaceship Earth 7The Inner Planets: Mercury & Venus 8Saturn: Lord of the Rings 9Alien Galaxies 10Life and Death of a Star 11The Outer Planets 12The Most Dangerous Place in the Universe 13Search for ET 14Beyond the Big Bang