gj 523b mega earth exoplanet
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Researchers identify ‘Mega-Earth,’ prompting questions of how it formed
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Astronomers discover a giant, rocky 'mega-Earth' 23 times more massive than our planet
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At 23.5 times Earth’s mass, GJ 523b is massive enough that standard planet-formation models struggle to explain why it didn’t accumulate a huge hydrogen-helium envelope — yet the planet is extraordinarily dense and apparently mostly rock, and astronomer
Space Daily
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