Activity for pipe‭

Type	On...	Excerpt	Status	Date
Question	—	How close could another solar system be without adversely affecting our own? I would like to know how close two planetary systems could be without having an adverse effect on each other. My goal is to drastically improve the chances of having habitable planets near enough that humans having the technology of today could realistically send manned spacecraft to other planetary ... (more)	—	almost 6 years ago