NGC 4939

NGC 4939 is a barred spiral galaxy in the constellation Virgo about 145 million ly from Earth. It spans roughly 240,000 ly, about 2.4 times the width of our Milky Way. It is receding from us at about 3,091 km/s.

Because its light is 145 million ly from home, you are seeing NGC 4939 as it looked roughly 145 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).