Oct 27, 1972. The planet Mars has many victims. Specifically, spacecraft. There have been so many failed missions to Mars, that scientists are rumbling about a "Mars Curse". But one mission is defying the odds.

Mariner 9, an American space probe, has been orbiting Mars for the last year. But now, it's running out of fuel and will be deactivated, having met all of its mission objectives. Mariner 9 gave us our closest look ever at the Red Planet, solving mysteries that have been debated for centuries.

Today, humanity's relationship with Mars. How did people come to believe it had expansive forests and a Martian civilization? And how did one epic mission bring us closer to understanding what's really happening on the Red Planet?

Special thanks to William Sheehan, author of Discovering Mars: A History of Observation and Exploration of the Red Planet; and Kevin Schindler, historian of the Lowell Observatory in Flagstaff, Arizona.

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