NGC 5579

NGC 5579 is a spiral galaxy in the constellation Boötes about 167 million ly from Earth. It spans roughly 73,000 ly, about 73% of our Milky Way's width. The light reaching us tonight left it about 167 million years ago.

Because its light is 167 million ly from home, you are seeing NGC 5579 as it looked roughly 167 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).