Mysterious mars - Earth’s older brother | Tomorrow Today - Interview

  • 11 years ago
The Red planet was once a warmer Planet, certainly above freezing on the surface, and that there was perhaps liquid water there. What does this tell us now? How did that change? Ulrich Köhler from the German Aerospace Center joins us in the studio.

More Tomorrow today: http://www.dw.de/program/tomorrow-today/s-3062-9798

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