In their paper, the authors propose two different indices: an Earth Similarity Index (ESI) and a Planetary Habitability Index (PHI).

在他们的论文中，作者提出了两个不同的指标：地球相似性指数(ESI)和行星的宜居指数(PHI)。

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Mankind faces "a planetary emergency", he said; "a crisis that threatens the survival of our civilisation and the habitability of the Earth."

他说人类正面临“星球危机”，“一个威胁着人类文明延续和地球可居住性的紧要关头”。

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Even before the space telescope takes flight, scientists expect to learn more about the habitability of our nearest planetary neighbor.

甚至在太空望远镜升空之前，科学家们就已经在试图了解我们最近的行星邻居是否可以居住。

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Eventually, researchers hope to develop a more detailed Planetary Habitability Index that factors in the idea that life might exist under exotic conditions unknown on Earth.

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In its solar system there is another planet, Gliese-581d, that is also of interest in the search for life, according to the Planetary Habitability Laboratory at the University of Puerto Rico at Arecibo.

CNN: 3 new planets could host life

"There is no agreement by the astrobiology community on how to measure habitability, " said Abel Mendez, director of the Planetary Habitability Laboratory at the University of Puerto Rico at Arecibo, who is working on several planetary indexing systems.

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