- Rigil Kentaurus (stars.astro.illinois.edu)
RIGIL KENTAURUS (Alpha Centauri) with PROXIMA CENTAURI (Alpha Cen C). Among the most famed stars of the entire sky, surely rival in renown to Sirius and Polaris even though not visible to much of the world’s population, is the “foot of the Centaur,” Rigil Kentaurus, “Rigil Kent,” the first star of Centaurus, probably much better known as Alpha Centauri or just Alpha Cen.
- Globular cluster (Wikipedia)
A globular cluster is a spheroidal conglomeration of stars that is bound together by gravity, with a higher concentration of stars towards their centers. They can contain anywhere from tens of thousands to many millions of member stars, all orbiting in a stable, compact formation. Globular clusters are similar in form to dwarf spheroidal galaxies, and the distinction between the two is not always clear. Their name is derived from Latin globulus (small sphere). Globular clusters are occasionally known simply as “globulars”.