IC 4574

IC 4574 is a barred spiral galaxy in the constellation Corona Borealis about 455 million ly from Earth. It spans roughly 83,000 ly, about 83% of our Milky Way's width. The light reaching us tonight left it about 455 million years ago.

Because its light is 455 million ly from home, you are seeing IC 4574 as it looked roughly 455 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). Distance computed by gravityfinder from redshift via Hubble's law (H0 = 70 km/s/Mpc).