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Episode 2: You've heard of the endless summer - how does an endless winter sound?

Play Sep 22•4:45

New studies of Martian meteorites that have landed on Earth suggest that Mars has been colder than freezing for an extremely long time. Detailed chemical analysis of the Mars meteorites, including the famous ALH84001 meteorite from Allan Hills in Antarctica, shows the long-term temperature of those rocks as very cold. During the last 4 billion years, Mars was likely never warm enough for...

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