A pair of interacting galaxies, NGC 4038 and 4039, lying 60 million l.y. away in the constellation Corvus. They have two long, faint, curved, tails extending for 360 000 l.y. (over 20′ on the sky), which give them their name. The tails are probably composed of stars pulled out by gravitational tidal interactions during the collision of a spiral and a lenticular galaxy.
Subjects: Astronomy and Astrophysics.