Exporting terrestrial life out of the Solar System requires a process that both embeds microbes in boulders and ejects those boulders out of the Solar System. We explore the possibility that Earthgrazing long-period comets (LPCs) and interstellar objects (ISOs) could export life from Earth by collecting microbes from the atmosphere and receiving a gravitational slingshot effect from the Earth. We estimate the total number of exportation events over the lifetime of the Earth to be ~1–10 for LPCs and ~1–50 for ISOs. If life existed above an altitude of 100 km, then the number is dramatically increased up to ~105 exportation events over Earth's lifetime.

中文翻译：

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用掠地天体的引力弹弓将地球生命输出太阳系

将地球生命从太阳系中输出需要一个过程，既将微生物嵌入巨石中，又将这些巨石排出太阳系。我们探索了掠地长周期彗星 (LPC) 和星际物体 (ISO) 通过从大气中收集微生物并接收来自地球的引力弹弓效应从地球输出生命的可能性。我们估计，在地球生命周期内，LPC 的输出事件总数约为 1-10，ISO 约为 1-50。如果生命存在于 100 公里以上的高度，那么这个数字会急剧增加到 ~105地球一生中的出口事件。