NGC 5580

NGC 5580 is a lenticular galaxy in the constellation Boötes about 154 million ly from Earth. It spans roughly 69,000 ly, about 69% of our Milky Way's width. The light reaching us tonight left it about 154 million years ago.

Because its light is 154 million ly from home, you are seeing NGC 5580 as it looked roughly 154 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).