It was famously said that at the height of its power the British Empire was so vast that the Sun never set on it. To be more precise, an astonishing 33.7 million square kilometres – almost a quarter of the planet’s land area – were touched by...
“Are we alone in the universe?” is one of the oldest and most universal questions. For a century or more it has stimulated brilliant science fiction—and it’s now incentivizing real science and exploration. But we still lack evidence—indeed...