Private money is bringing new ideas—and new concerns—to solar-geoengineering research
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Astrobiologists think they could point to more habitable areas on the red planet
Who will want a hundred-metre-high orb?
A new science—applied astrobiology—is taking shape
Also this week, AI in Europe, taxing the rich, critical minerals, supermarket shopping, paranoia, China’s tech elite
Why less ice might mean more fire
Our planetary-affairs editor, Oliver Morton, looks at the connection between space travel and climate science
