Proxima D: New Alien World Discovered In Planetary System 4.2 Light Years Away

STORY HIGHLIGHTS
Scientists have discovered a new planet in a solar system nearby. Named "Proxima d," the new alien world is the third found in that system. With a fraction of Earth's mass, the new planet is also one of the lightest exoplanets ever discovered. It orbits Proxima Centauri, a Sun-like star situated four light-years away.
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