Why Carl Sagan Didn't Think We Should Rush to Mars

The U.S. and Chinese governments hope to send humans to Mars in the 2030s. Elon Musk claims his SpaceX company may be able to accomplish the task even sooner. But is this a good use of Earth’s resources? Back in 1991 the legendary astronomer and science communicator Carl Sagan shared some ideas about how to think about that question.

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