IC 1558

IC 1558 is a spiral galaxy in the constellation Sculptor about 72 million ly from Earth. It spans roughly 59,000 ly, about 59% of our Milky Way's width. The light reaching us tonight left it about 72 million years ago.

Because its light is 72 million ly from home, you are seeing IC 1558 as it looked roughly 72 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).