Perhaps the only way to conquer space is to get a grip on the "afterlife" and communicate with it. Perhaps a succeeding generation down the pike a century or so will learn to do that. One of my first intimate partners ever (in 1976) claimed that he taught "the history of consciousness."
Update: June 2
I don't think the book author would agree with a project by Dmitry Itskov, to record the contents of the human brain on avatars, and offer digital immortality by the year 2045, NYTimes Business story here.