Thick atmosphere discovered on scorching, rocky planet twice Earth’s size offers scientists a rare opportunity

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A thick atmosphere has been detected around a planet twice as big as Earth in a nearby solar system, researchers reported on Wednesday. The so-called super Earth — known as 55 Cancri e — is among the few rocky planets outside our solar system with a significant atmosphere, providing a “rare window” for scientists. 55 Cancri e is wrapped in a blanket of carbon dioxide and carbon monoxide.

Instead, scientists say the discovery is a promising sign that other such rocky planets with thick atmospheres could exist that may be more hospitable. The exoplanet 41 light years away — each light year the equivalent of 9.7 trillion km — is eight times heavier than Earth and circles its star Copernicus so closely that it has permanent day and night sides. Its surface is encrusted with magma oceans.

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