NGC 3154

NGC 3154 is a barred spiral galaxy in the constellation Leo about 307 million ly from Earth. It spans roughly 74,000 ly, about 74% of our Milky Way's width. The light reaching us tonight left it about 307 million years ago.

Because its light is 307 million ly from home, you are seeing NGC 3154 as it looked roughly 307 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).