Most exoplanets, bodies orbiting stars other than the sun, are too far away for us to be able to send probes to. So it’s no wonder that the discovery of a possible habitable planet around the sun’s nearest neighbor star, Proxima Centauri, a few years ago generated a lot of excitement. Now we have spotted what we think is a second planet around this star. Our study, published in Science Advances, suggests this planet could have a mass about half that of the planet Neptune. Dubbed Proxima Centauri c (abbreviated to Proxima c), it has an orbit about 1.5 times…
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