NGC 3657

NGC 3657 is a spiral galaxy in the constellation Ursa Major about 57 million ly from Earth. It spans roughly 16,000 ly, about 16% of our Milky Way's width. It is receding from us at about 1,227 km/s.

Because its light is 57 million ly from home, you are seeing NGC 3657 as it looked roughly 57 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).