When astronomers from the Indian Institute of Astrophysics and their collaborators looked carefully at the galaxy NGC 3785, they found that not only does it have the longest tidal tail discovered so far, but that an ultra-diffuse galaxy is currently being formed at the end of this tidal tail as well.
This is based on the recently published paper titled "A Tale of NGC 3785: The formation of an ultra-diffuse galaxy at the end of the longest tidal tail", by Watts et al, 2024, Astronomy & Astrophysics, 691, L13.
Press release by PIB published here.
Press release issued by DST here.
Download the paper from here.