Does Proxima b have a Sister World?

Proxima Centauri b may not be alone out there.

The 2016 announcement of Proxima Centauri b was a watershed moment in exoplanet research. Not only had researchers found a potentially habitable Earth-mass planet, but it was at the nearest star to Earth. This means it could be one of the easiest systems to study using future telescopes.

But researchers are now looking into some promising signals suggesting there are more planets lurking in the system.

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