The Observable Universe is 93 billion light-years across — but the universe is older than that

The universe is 13.8 billion years old, yet the observable universe is 93 billion light-years in diameter — not 27.6 billion. The reason is cosmic expansion: space itself has stretched since the Big Bang, carrying distant galaxies further away than their light travel time would suggest. The CMB (cosmic microwave background) radiation we observe as noise on old TV sets is light from 380,000 years after the Big Bang, the moment the universe first became transparent. Everything beyond the observable horizon is simply too far away for light to have reached us yet.

Source: Planck Collaboration, Astronomy & Astrophysics (2020)