This artist's depiction shows a possible Earth-like planet with a rocky surface, oceans and an atmosphere. See more space tourism images.
模拟图描绘了类地行星，有岩石表面、海洋和大气。
The probes have also made the scientists think that under its surface, Europa has a rocky core giving off volcanic heat.
这些探测器还让科学家们认为，在木卫二的表面之下，有一个释放出火山的热量的岩石内核。
The PHI looks at a different set of factors, such as whether the world has a rocky or frozen surface, whether it has an atmosphere or a magnetic field.
而行星的宜居指数（PHI）则考察另外的一组因素，如该星球是否有岩石或冰冻的表面，是否有大气层或磁场的存在。
This photo shows the Mars dry and rocky surface of Mars on the three cars covered with dust from the anti-pad in a depression.
此照片显示火星干燥且多岩石地表上的此火星车3个尘埃覆盖着的防陷垫中的一个。
This photo shows the Mars dry and rocky surface of Mars on the three cars covered with dust from the anti-pad in a depression.
此照片显示火星干燥且多岩石地表上的此火星车3个尘埃覆盖着的防陷垫中的一个。
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