太阳系外的海洋在整个银河系都很常见吗？
Are extrasolar oceans common throughout the Galaxy?
摘要：
根据微透镜实验的一些初步结果，轻而冷的太阳系外行星，如OGLE 2005-BLG-390 Lb，一颗通过微透镜探测到的5.5地球质量的行星，可能在银河系中很常见。这些行星可能是冰冻的岩石行星或海洋行星，位于雪线之外，因此，在其系统的宜居带之外。尽管如此，它们仍然可以在冰壳表面下容纳一层液态水，由辐射能加热，数十亿年，然后完全冻结。这些结果表明，冰下的海洋，就像太阳系中被怀疑存在于冰冷卫星上的海洋一样，可能是寒冷的低质量太阳系外行星的共同特征。
英文摘要：
Light and cold extrasolar planets such as OGLE 2005-BLG-390Lb, a 5.5 Earth-mass planet detected via microlensing, could be frequent in the Galaxy according to some preliminary results from microlensing experiments. These planets can be frozen rocky- or ocean-planets, situated beyond the snow line and, therefore, beyond the habitable zone of their system. They can nonetheless host a layer of liquid water, heated by radiogenic energy, underneath an ice shell surface for billions of years, before freezing completely. These results suggest that oceans under ice, like those suspected to be present on icy moons in the Solar system, could be a common feature of cold low-mass extrasolar planets.
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