阅读难度：

Astronomers have confirmed the existence of an Earth-like planet in the "habitable zone" around a star, BBC reported.

The planet, Kepler 22-b, lies about 600 light-years away, is about 2.4 times the size of Earth and has a temperature of about 22 degrees Celsius.

However, the team does not yet know if Kepler 22-b is made mostly of rock, gas or liquid.

Kepler 22-b lies at a distance from its sun about 15% less than the distance from the Earth to the Sun, and its year takes about 290 days.

（点击BBC网站查看原文）

天文学家发现“另一个地球”

       据英国广播公司报道，天文学家确认发现一颗类似地球的行星，该行星处于“可居住带”，围绕一颗恒星旋转。

       这颗行星叫开普勒-22b，距离地球600光年，约为地球体积的2.4倍，气温约22摄氏度。

       但是，科研团队尚不清楚该行星的主要组成物质是岩石、气体还是液体。

       它与自身绕转的恒星距离比地球与太阳之间的距离短15%，每年大概为290天。

(China.org.cn December 7, 2011)