Extras

    Video thumbnail: NOVA The Planets: Mars Preview

    NOVA

    The Planets: Mars Preview

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

    The Planets: Mars Preview

    Video thumbnail: NOVA Five Facts About the Red Planet

    NOVA

    Five Facts About the Red Planet

    Getting to know our red celestial neighbor.

    Five Facts About the Red Planet

    Video thumbnail: NOVA Mars, the Red Planet, Was Once Blue

    NOVA

    Mars, the Red Planet, Was Once Blue

    Mars once had rains, rivers, and in the northern hemisphere, a vast sea.

    Mars, the Red Planet, Was Once Blue