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A new study says a planet outside our solar system thought to be in the so-called Goldilocks zone is not even a real planet, but a cosmic masquerade.
Astronomers have discovered what they say is the most Earth-like planet yet detected — a distant, rocky world that's similar in size to our own and ...
Peering into the far reaches of the solar system, astronomers have spied a pink frozen world 7½ billion miles from the sun. It's the second such ...
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