IC 373

IC 373 is a lenticular galaxy in the constellation Eridanus about 188 million ly from Earth. It spans roughly 54,000 ly, about 54% of our Milky Way's width. The light reaching us tonight left it about 188 million years ago.

Because its light is 188 million ly from home, you are seeing IC 373 as it looked roughly 188 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).