NGC 4502

NGC 4502 is a spiral galaxy in the constellation Coma Berenices about 75 million ly from Earth. It spans roughly 23,000 ly, about 23% of our Milky Way's width. The light reaching us tonight left it about 75 million years ago.

Because its light is 75 million ly from home, you are seeing NGC 4502 as it looked roughly 75 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).