NGC 6391

NGC 6391 is an elliptical galaxy in the constellation Draco about 378 million ly from Earth. It spans roughly 82,000 ly, about 82% of our Milky Way's width. The light reaching us tonight left it about 378 million years ago.

Because its light is 378 million ly from home, you are seeing NGC 6391 as it looked roughly 378 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).