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太阳系外发现首个布满岩石的行星


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近日,天文学家最终获得了确凿证据,他们成功测得太阳系外的一颗行星的质量,发现其密度和地球接近。这是科学家证实的第一颗同地球密度接近的类地行星。

科学家们把这颗行星命名为“COROT-7b”,它跟地球差不多大小,但是该行星白天温度可达2000摄氏度,夜间温度又降到零下200摄氏度,其围绕一颗距离地球500光年的恒星运转,这颗行星被大量的熔岩和沸腾的海洋覆盖。

虽然在这之前科学家们就在太阳系外发现了330颗行星,但这颗却是最小,也是唯一一颗由岩石组成的行星。

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