rs suitable to life. e are in t one.”

    Rees maintains t six numbers in particular govern our universe, and t if any of tly t be as to exist as it does requires t ed to comparatively stately manner—specifically, in a  converts seven one-ts mass to energy. Lo value very slig to 0.006 percent,say—and no transformation could take place: t of ly—to 0.008 percent—and bonding  ted. In eitest t  be here.

    I s everyt rigerm, gravity may turn out to be alittle too strong, and one day it may  t collapsingin upon itself, till it crusself doo anoty, possibly to start t may be too il everyt t terial interactions, sot t is inert and dead, but very roomy. tion ist gravity is just rigical density” is ts’ term for it—and t it  just t dimensions to alloo go on indefinitely.

    Cosmologists in ter moments sometimes call t—teveryt rigivelyas closed, open, and flat.)Noion t o all of us at some point is:  to t  your ains?

    would you find beyond?

    tingly, is t you can never get to t’s notbecause it ake too long to get t  because even ifyou traveled outraigely and pugnaciously, you  an outer boundary. Instead, you o  in t t adequately imagine, in conformance ein’s tivity (o in due course). For t it isenougo kno  adrift in some large, ever-expanding bubble. Rat allo to be boundless but finite. Space cannot even properly be saidto be expanding because, as t and Nobel laureate Steven einberg notes, “solarsystems and galaxies are not expanding, and space itself is not expandin