We may have a new planetary neighbor orbiting just four light-years away.
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Astronomers have detected evidence of a third planet orbiting Proxima Centauri, our sun's nearest stellar neighbor, at 25 trillion miles away. A light-year, the distance light travels in one year in a vacuum, is equivalent to about 5.88 trillion miles .With a mass about a quarter of Earth's, the rocky object is one of the lightest exoplanets ever found. A study detailing the discovery published Thursday in the journal Astronomy & Astrophysics.
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