The universe is expanding and it is an accelerating expansion (google expansion of the universe and Hubble constant and dark energy) cool stuff! While objects in space and light itself can not travel faster than the speed of light that restriction does not apply to 'space time' so the universe itself (the distance between galaxies) can expand faster than the speed of light. So while the expansion only started 13.7 bln.yrs. ago the farthest thing we can see is currently 46 bln. lightyrs away because the space between us and those distant objects has expanded that much in that amount of time. Also the expansion is why beyond a certain distance nothing will ever be observable because the light from a galaxy that far away can never reach us.
I have a bet with a guy as to whether the universe is flat and infinite or a finite hypersphere. If it is a sphere then it would be a 3dimensional spherical surface with no inside and no outside. That's hard to envision mentally but physically it is possible and beginning to look likely.
I'm no expert, I just dabble in this stuff because it's fascinating