Can I lend you a hand? How about an entire arm — the Cygnus Arm, that is. The Milky Way has two major spiral arms named for the constellations in their proximity — Scutum-Centaurus and Perseus — and two minor arms — Sagittarius and Cygnus — along with at least two smaller spurs.
Phil Harrington’s binocular universe: The Cygnus Arm flexes its muscle
September 2008:
