A very great and expansive portion of our own local universe isn't detectable, isn't revealed, to us inside the cave, the well, of the local of Earth. It is only when we break out of the cave that we will begin to learn what we cannot learn from deep inside the cave (from deep inside the well) looking out, trying to detect out, from the smallest end opening of a proverbial "cone". As with the cave man of tens of thousands of years ago, scientists think they are seeing and detecting, and telling, just about all there is to see and detect, and tell, of the universe from within the cave, the well, bounds (from the smallest end opening) of the "cone" they do manage to illustrate as such.
They do manage, too, to illustrate a look in the opposite direction of "cone" onto the universe. Their own viewpoint of a look from the largest end opening to the point-portal at the other end of the "cone" (which too many see as a totally closed point-period). From either end of the cone, from both ends of said "cone," there is a too limited revelation of the universe outside the cave (the well) . . . outside the cone's [ever expansive / ever narrowing] curvature.
They do manage, too, to illustrate a look in the opposite direction of "cone" onto the universe. Their own viewpoint of a look from the largest end opening to the point-portal at the other end of the "cone" (which too many see as a totally closed point-period). From either end of the cone, from both ends of said "cone," there is a too limited revelation of the universe outside the cave (the well) . . . outside the cone's [ever expansive / ever narrowing] curvature.