the Hubble Ultra Deep Field (HUDF), the deepest image of the universe ever
taken in visible light. Pictured above, the HUDF shows a sampling of the
oldest galaxies ever seen, galaxies that formed just after the dark ages, 13
billion years ago, when the universe was only 5 percent of its present age.
universe is at least 78 billion light years radius or 156 billion light years
Hubble Ultra Deep Field
Source: NASA (public domain)