NGC 3840

NGC 3840 is a spiral galaxy in the constellation Leo about 343 million ly from Earth. It spans roughly 79,000 ly, about 79% of our Milky Way's width. It is receding from us at about 7,409 km/s.

Because its light is 343 million ly from home, you are seeing NGC 3840 as it looked roughly 343 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).