NGC 5157

NGC 5157 is a spiral galaxy in the constellation Canes Venatici about 341 million ly from Earth. It spans roughly 130,000 ly, about the width of our Milky Way. It is receding from us at about 7,240 km/s.

Because its light is 341 million ly from home, you are seeing NGC 5157 as it looked roughly 341 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).