An Etymological Dictionary of Astronomy and Astrophysics

An elongated structure often found at the interface between an → H II region and its associated → molecular cloud. Also called → elephant trunk. The most famous examples are the “pillars of creation” in the → Eagle Nebula, which are several → light-years in length. There are indications for star formation at the tips of the pillars. In general the pillars point like fingers toward the young → massive stars ionizing the nebula. Most of the mass is concentrated in the head which has a bright rim facing the young stars.

Etymology (EN): M.E. pillare, O.Fr. piler, from M.L. pilare, from L. pila “pillar, stone barrier.”

Etymology (PE): Sotun “pillar,” → column.