An Etymological Dictionary of Astronomy and Astrophysics

A young (≤ 100 million years) association of stars (abbreviated TWA) with at least 27 members,
from → intermediate mass stars to planetary mass objects. Five of them, including → TW Hydrae, display signatures of → T Tauri stars. TWA is the first moving group of young nearby (≤ 100 → paesecs) stars to be identified.

See also: → TW Hydrae; → association.