IC 4545

IC 4545 is a spiral galaxy in the constellation Apus about 125 million ly from Earth. It spans roughly 74,000 ly, about 74% of our Milky Way's width. The light reaching us tonight left it about 125 million years ago.

Because its light is 125 million ly from home, you are seeing IC 4545 as it looked roughly 125 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).