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Closest exoplanet is remarkably Earth-sized | Science/AAAS | News:
In 2012, astronomers reported a planet orbiting Alpha Centauri B, an orange star that belongs to the closest star system to the sun, located a mere 4.3 light-years from Earth (artist's conception shown). [] Now, as other astronomers report in work submitted to The Astrophysical Journal, computer simulations of the planet's history indicate that the orbit isn't face-on, which in turn means the world is only one to three times as massive as Earth. This implies that the planet may have a terrestrial composition. Before you snap up any real estate here, though, be forewarned that the planet's day side is hot enough to melt lead.
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