NGC 3631

NGC 3631 is a spiral galaxy in the constellation Ursa Major about 54 million ly from Earth. It spans roughly 58,000 ly, about 58% of our Milky Way's width. It is receding from us at about 1,143 km/s.

Because its light is 54 million ly from home, you are seeing NGC 3631 as it looked roughly 54 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).