Definition of Serpens
- The main object of interest in Serpens Caput is the globular cluster M5, down in the south of the region, near the border with Virgo.
- —Adrian Berry, Daily Telegraph (London), 1 June 2009
- Their latest discovery is a double star in the planetary nebula cataloged as Abell 41, located in the constellation Serpens Cauda. These stars orbit each other in only 2 hours and 43 minutes, indicating that they are extremely close together.
- —D. E. Thomsen, Science News, 16 Apr. 1983