The goodness of being multi-planetary

The Economist has a leader “For life, not for an afterlife“, in which it argues that Elon Musk’s stated motivation to settle Mars – making humanity a multi-planetary species less likely to go extinct – is misguided: “Seeking to make Earth expendable is not a good reason to settle other planets”. Is it misguided, or is the Economist‘s reasoning misguided? Continue reading

Invasion from the blue planet: are we protecting Mars too much?

Are we overprotective of Mars? That is the claim made by Alberto G. Fairén and Dirk Schulze-Makuch in a recent commentary in Nature Geoscience. They argue that current planetary protection policies that try to prevent bodies in the solar system from becoming contaminated by Earth-life are too costly, inhibit scientific exploration and might actually be unnecessary because of natural contamination. How much value does a pristine non-terrestrial environment have?

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