论文标题
液态水生物化学的潜力深处在月球，火星及以后
Potential For Liquid Water Biochemistry Deep Under The Surfaces Of The Moon, Mars And Beyond
论文作者
论文摘要
我们调查了过去或当前存在的前景，在月球和火星表面的深处以及通用的绑定和自由浮动的岩石外岩石物体之下。我们构建了一个简单的模型，该模型考虑了给定物体的寿命以及大小，表面温度和相对放射性核素丰度，并产生地下可居住区的空间范围。我们还调查了对居住性压力所施加的约束，并表明不太可能完全排除生活的前景。我们从充满活力的角度估算在深度地下环境中可能可持续的最大生物量，这是上述参数的函数。我们发现，在理想情况下，它可能是地球地下生物圈的百分之几，比地球全球生物量小三个数量级。最后，我们简要阐述了具有深层生物圈的岩石物体的普遍性，以及通过即将到来的任务参观月球和火星来检测生物活动的特征的方法。
We investigate the prospects for the past or current existence of habitable conditions deep underneath the surfaces of the Moon and Mars as well as generic bound and free-floating extrasolar rocky objects. We construct a simple model that takes into account the thermal limits of life as well as the size, surface temperature, and relative radionuclide abundance of a given object and yields the spatial extent of the subsurface habitable region. We also investigate the constraint imposed by pressure on habitability, and show that it is unlikely to rule out the prospects for life altogether. We estimate the maximum biomass that might be sustainable in deep subsurface environments as a function of the aforementioned parameters from an energetic perspective. We find that it might be a few percent that of Earth's subsurface biosphere, and three orders of magnitude smaller than Earth's global biomass, under ideal circumstances. We conclude with a brief exposition of the prevalence of rocky objects with deep biospheres and methods for detecting signatures of biological activity through forthcoming missions to visit the Moon and Mars.
