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Universe in a bubble

Maybe we don’t have to speculate about what life is like inside a bubble. It might be the only cosmic reality we know

J Richard Gott

Echoes of a black hole

Ripples in space-time could herald the demise of general relativity and its replacement by a quantum theory of gravity

Sabine Hossenfelder

Life rocks

Could meteorites be akin to lifeboats from other planets? Or do they reveal more about life on Earth than off it?

Philip Ball

Life on Mars

In a white dome on a bare mountain, six of us are road-testing life in a Martian colony. This is what I’ve learned so far

Sheyna Gifford