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Everything we can see, on one logarithmic map: the Sun in the middle, the Big Bang at the rim.
The observable universe is not the universe. It is the part close enough that light emitted after the Big Bang has arrived. The universe beyond it is probably far larger, and possibly infinite.
The boundary moves outward every day.
Matter is not spread evenly. It hangs in filaments strung around empty voids. On the largest scales the universe looks like foam, or like the inside of a sponge. Galaxies are not scattered at random:…
Light travel time sets the size. Because space expanded while the light was in flight, the objects whose light we see at 13.8 billion years are now about 46 billion light years away.
Everything in this whole drawing below this level is made of the 5%.