IC 584

IC 584 is a spiral galaxy in the constellation Leo about 249 million ly from Earth. It spans roughly 36,000 ly, about 36% of our Milky Way's width. It is receding from us at about 5,459 km/s.

Because its light is 249 million ly from home, you are seeing IC 584 as it looked roughly 249 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).