NGC 3558

NGC 3558 is an elliptical galaxy in the constellation Ursa Major about 448 million ly from Earth. It spans roughly 130,000 ly, about the width of our Milky Way. It is receding from us at about 9,515 km/s.

Because its light is 448 million ly from home, you are seeing NGC 3558 as it looked roughly 448 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).