Extras
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
Before it was a dry planet, Mars was a wet world that may have hosted life.
Become a KLRN member to enjoy
KLRN
Passport
Get extended access to 1600+ episodes, binge watch your favorite shows, and stream anytime - online or in the PBS app.
Already a KLRN member?
You may have an unactivated KLRN Passport member benefit. Check to see.