IC 3157

IC 3157 is a lenticular galaxy in the constellation Virgo about 835 million ly from Earth. It spans roughly 230,000 ly, about 2.3 times the width of our Milky Way. The light reaching us tonight left it about 835 million years ago.

Because its light is 835 million ly from home, you are seeing IC 3157 as it looked roughly 835 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).