论文标题
行星系统之间的岩石转移：panpermia重新审视
Transfer of Rocks between Planetary Systems: Panspermia Revisited
论文作者
论文摘要
由于最近发现穿过太阳系的星际物体以及动态模拟的最新发展，本文重新吸收了生命的可能性，该生命的可能性将岩石从一个行星系统转移到另一个行星。现在可以估计该岩石植物过程的天文学方面，包括岩石捕获的横截面，岩石喷射的速度分布，捕获物体的生存时间以及在其出生群和现场中太阳系的动力学。其余的不确定性主要是生物学的，即行星上生命的可能性，这种事件所需的时间以及生命在新环境中播种的效率。使用当前的输入量估计值，我们发现传递率在出生集群中有所提高，但是成功的赔率太低了，对于Panspermia而言，很可能发生。相比之下，预计太阳系中的外星岩石的预期清单被预计是实质的（其中绝大多数此类物体都不是生物学活跃的，并且与地球没有相互作用）。
Motivated by the recent discovery of interstellar objects passing through the solar system, and by recent developments in dynamical simulations, this paper reconsiders the likelihood for life bearing rocks to be transferred from one planetary system to another. The astronomical aspects of this lithopanspermia process can now be estimated, including the cross sections for rock capture, the velocity distributions of rocky ejecta, the survival times for captured objects, and the dynamics of the solar system in both its birth cluster and in the field. The remaining uncertainties are primarily biological, i.e., the probability of life developing on a planet, the time required for such an event, and the efficiency with which life becomes seeded in a new environment. Using current estimates for the input quantities, we find that the transfer rates are enhanced in the birth cluster, but the resulting odds for success are too low for panspermia to be a likely occurrence. In contrast, the expected inventory of alien rocks in the solar system is predicted to be substantial (where the vast majority of such bodies are not biologically active and do not interact with Earth).
