地外环境中的自维持生命栖息地
Self-sustaining living habitats in extraterrestrial environments
AI总结：
本文放宽宜居性需行星重力井的假设，评估发现生物生成屏障可在太阳系1-5天文单位创造宜居条件，论证自维持生命栖息地的物理可行性，其对太空生命支持及地外生命探测具重要意义。
摘要：
宜居性的标准定义假定生命需要行星重力井来稳定液态水并调节表面温度。本文评估了放宽这一假设的后果。温度、压力、挥发物损失、辐射水平和养分可用性似乎都是太空中或大气层稀薄天体上光合生命生存的可克服障碍。能够透射可见光、阻挡紫外线、维持25-100 K温度梯度以及抵抗太空真空的10 kPa压力差的生物生成屏障，可在太阳系1至5天文单位之间创造宜居条件。因此，考虑到地球生物材料的已知能力，能够为自身生存创造条件的生态系统在物理上是可行的。地外环境中光合生命的生物源栖息地将为人类在太空的生命支持和可持续性带来重大益处。由于其他地方的生命进化可能遵循与地球截然不同的路径，生命栖息地也可能存在于其他恒星周围的传统宜居环境之外，在那里它们将具有不寻常但潜在可探测的生物特征。
英文摘要：
Standard definitions of habitability assume that life requires the presence of planetary gravity wells to stabilize liquid water and regulate surface temperature. Here the consequences of relaxing this assumption are evaluated. Temperature, pressure, volatile loss, radiation levels and nutrient availability all appear to be surmountable obstacles to the survival of photosynthetic life in space or on celestial bodies with thin atmospheres. Biologically generated barriers capable of transmitting visible radiation, blocking ultraviolet, and sustaining temperature gradients of 25-100 K and pressure differences of 10 kPa against the vacuum of space can allow habitable conditions between 1 and 5 astronomical units in the solar system. Hence ecosystems capable of generating conditions for their own survival are physically plausible, given the known capabilities of biological materials on Earth. Biogenic habitats for photosynthetic life in extraterrestrial environments would have major benefits for human life support and sustainability in space. Because the evolution of life elsewhere may have followed very different pathways from on Earth, living habitats could also exist outside traditional habitable environments around other stars, where they would have unusual but potentially detectable biosignatures.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
