NGC 4004B

NGC 4004B is an elliptical galaxy in the constellation Leo about 156 million ly from Earth. It spans roughly 35,000 ly, about 35% of our Milky Way's width. The light reaching us tonight left it about 156 million years ago.

Because its light is 156 million ly from home, you are seeing NGC 4004B as it looked roughly 156 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).