The Edge of the Observable Universe

The oldest light that we can see comes from the cosmic marce wave background. The universe is expanding, by which we mean new space is being created between stuff all the time. And this new space is beingcreated between our galaxy and other galaxies,. So the distance between us and other galaxies can be increasing even if we have no relative velocity. Riting just i creat new space between them. That's what we call dark energy.