NGC 4100

NGC 4100 is a barred spiral galaxy in the constellation Ursa Major about 50 million ly from Earth. It spans roughly 66,000 ly, about 66% of our Milky Way's width. It is receding from us at about 1,131 km/s.

Because its light is 50 million ly from home, you are seeing NGC 4100 as it looked roughly 50 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). Recession velocity from RC3 (de Vaucouleurs et al. 1991, via NASA/HEASARC, public domain). Distance computed by gravityfinder from redshift via Hubble's law (H0 = 70 km/s/Mpc).