NGC 5003

NGC 5003 is a spiral galaxy in the constellation Canes Venatici about 500 million ly from Earth. It spans roughly 150,000 ly, about the width of our Milky Way. The light reaching us tonight left it about 500 million years ago.

Because its light is 500 million ly from home, you are seeing NGC 5003 as it looked roughly 500 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).