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Proxima Centauri b: Have we just found Earth’s cousin right on our doorstep?

24 Aug 2016, 17:00 UTC
Proxima Centauri b: Have we just found Earth’s cousin right on our doorstep?
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What began as a tantalizing rumor has just become an astonishing fact. Today a group of thirty-one scientists, led by Guillem Anglada-Escude at the Queen Mary University of London, UK, announced the discovery of a terrestrial exoplanet orbiting Proxima Centauri. The discovery of this planet, Proxima Centauri b, is a huge breakthrough not just for astronomers but for all of us. Here’s why.
This artist’s impression shows a view of the surface of the planet Proxima b orbiting the red dwarf star Proxima Centauri, the closest star to the Solar System. The double star Alpha Centauri AB also appears in the image to the upper-right of Proxima itself. Proxima b is a little more massive than the Earth and orbits in the habitable zone around Proxima Centauri, where the temperature is suitable for liquid water to exist on its surface. Credit: ESO/M. Kornmesser
Astronomers know that exoplanets, or planets in orbit around stars other than our own, are numerous in our galaxy. NASA’s Kepler Space Telescope, which spent four years staring almost continuously at a tiny, distant patch of the sky, proved that there are on average two exoplanets per star in the Milky Way. That’s a lot of worlds! ...

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