Life on a planet beyond our 1)solar system: could it be possible? Well, NASA’s been on the lookout and it seems they’ve just spotted Earth’s twin.
They call it Kepler 22B and it sits about 600 light years away. It’s about 2? times the size of Earth and circles a sun not unlike our own. Though scientists are unsure whether it’s made mostly of rock, gas or liquid, they confirm that this planet falls within its sun’s 2)habitable zone, a distance that could allow for the existence of water. The discovery was made by NASA’s Kepler spacecraft, and marks the best 3)candidate yet for an earth-like twin.
太阳系外的某个星球有生命存在――这可能吗？美国宇航局对此一直进行密切关注。而如今，他们似乎刚发现了地球的“孪生姐妹”。
美国宇航局将此行星命名为开普勒22B，它距离地球大约600光年，体积大约为地球的2.5倍。它也围绕着一颗恒星运行，与地球围绕的太阳无异。尽管科学家目前仍不清楚那颗行星究竟主要由岩石、气体还是液体构成，但可以肯定的是，它与它所绕行的恒星之间的距离适中，为水的存在创造了条件。该行星是由美国宇航局的开普勒飞船所发现的。这也是迄今为止所发现的与地球最相似的行星。
新闻链接 NASA 美国宇航局