The newfound, possibly Earth-like planet Proxima b lies just 4.2 light-years away. So why did it take astronomers so long to discover it?
from Space.com ift.tt/2bPMbQi
The newfound, possibly Earth-like planet Proxima b lies just 4.2 light-years away. So why did it take astronomers so long to discover it?
from Space.com ift.tt/2bPMbQi
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