Mars once was wet and fertile. It's now bone dry. Something bad happened on Mars. I want to know what happened on Mars so that we may prevent it from happening here on Earth.

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• Neil deGrasse Tyson:

  The first colony on Mars is not going to be built by a private company. How are you going to make m

• Neil deGrasse Tyson:

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• Neil deGrasse Tyson:

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• Neil deGrasse Tyson:

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• Neil deGrasse Tyson:

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• Neil deGrasse Tyson:

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• Neil deGrasse Tyson:

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