Tags: Galaxy.
Arp 104 also known as Keenan’s system is entry 104 in Halton Arp’s Atlas of Peculiar Galaxies catalog for spiral galaxy NGC 5216 and globular galaxy NGC 5218. The two galaxies are joined by a bridge of galactic material spanning 22 000 light years.In 1790 William Herschel discovered the galaxies and in 1926 they were studied by Edwin Hubble. In 1935 Philip C.