The hunt for life on a moon of Jupiter begins

NEARLY HALF A BILLION MILES FROM EARTH, A WORLD may be stirring.

- JEFFREY KLUGER

Our planet is the only one on which we know life exists. But if the basic sciences of chemistry, energy, and biology apply, Jupiter's moon Europa may be alive as well. NASA aims to start finding out, with the October launch of the $5 billion Europa Clipper spacecraft on a 5-year journey to the Jovian system for the most detailed exploration ever of the mysterious icy moon.