NGC 5255

NGC 5255 is a spiral galaxy in the constellation Ursa Major about 323 million ly from Earth. It spans roughly 130,000 ly, about the width of our Milky Way. The light reaching us tonight left it about 323 million years ago.

Because its light is 323 million ly from home, you are seeing NGC 5255 as it looked roughly 323 million years ago. The photons left before that much of history had passed, and are only now reaching us. This distance is estimated from the galaxy's redshift, so the lookback time is approximate.

Source: structural data (position, morphology, brightness, redshift) from OpenNGC (CC BY-SA). Distance computed by gravityfinder from redshift via Hubble's law (H0 = 70 km/s/Mpc).