How Everything Works on Instagram: "The portion of the universe we can observe today spans roughly 93 billion light-years across—about 46 billion light-years in every direction from Earth. This immense distance comes from the fact that the universe began around 13.8 billion years ago, but as space itself has expanded, the galaxies that emitted the earliest light are now far more distant than their light-travel time implies. Beyond this observable boundary lies one of cosmology’s greatest mysteri