NGC 5791

NGC 5791 is an elliptical galaxy in the constellation Libra about 154 million ly from Earth. It spans roughly 120,000 ly, about the width of our Milky Way. It is receding from us at about 3,332 km/s.

Because its light is 154 million ly from home, you are seeing NGC 5791 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). Recession velocity from RC3 (de Vaucouleurs et al. 1991, via NASA/HEASARC, public domain). Distance computed by gravityfinder from redshift via Hubble's law (H0 = 70 km/s/Mpc).