There’s no limit to the questions we’d have to answer to know where, how, or even if the universe ends. But all evidence suggests that we’re not just suspended in some free-form void: Space bends around anything with mass the way a trampoline sags under a dropped ball; black holes send out ripples of gravitational waves like pebbles in a cosmic pond; and gaps between galaxies stretch and contort over time. All these distortions give us the spark of an inkling of how the whole thing might take shape. Though massive objects pock the fabric of spacetime with little dips and hills, astrophysicists think the way all those shifts average out could reveal space’s true form. Is the cosmos bent more outward than inward, or does everything shake out to be basically flat? These sketches show how that stretching might work.