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An artist's rendering shows a moon with a diameter roughly 2.6 times that of Earth orbiting a large gas giant planet in another solar system located about 5,700 light years from our solar system, in an undated handout illustration. Scientists using what is called the transmit method have found evidence of the existence of this moon, which is only the second moon detected outside our solar system. Helena Valenzuela Widerstrom/Handout via REUTERS THIS IMAGE HAS BEEN SUPPLIED BY A THIRD PARTY. MANDATORY CREDIT. NO RESALES. NO ARCHIVES.
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