NGC 4791

NGC 4791 is a barred spiral galaxy in the constellation Virgo about 117 million ly from Earth. It spans roughly 36,000 ly, about 36% of our Milky Way's width. The light reaching us tonight left it about 117 million years ago.

Because its light is 117 million ly from home, you are seeing NGC 4791 as it looked roughly 117 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).