The map in all directions (as seen from a point closest to the Earth) of the relic radiation from the Big Bang, the oldest light in existence. To the naked eye the universe is black but with well prepared telescopes, the universe, indeed, glows… You see this in all directions, like inside the fire of an explosion. The sliding to red shows up parts of the universe that are hottest and the blueish are the coldest. When the universe had no neutrons, the universe was a glowing hot fog of plasma because the particles darted freely full of energy, but when it cooled and the protons combined with the electrons to form neutral atoms, the radiation started to fade until it became “transparent”, until the birth of the stars that started to squash matter angrily and churned out the reality we see now.
Remember, when you watch the space above, you are just gazing at one of the greatest lies in the universe. Blame your eyes.