IC 537

IC 537 is a lenticular galaxy in the constellation Hydra about 180 million ly from Earth. It spans roughly 69,000 ly, about 69% of our Milky Way's width. The light reaching us tonight left it about 180 million years ago.

Because its light is 180 million ly from home, you are seeing IC 537 as it looked roughly 180 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).