Blue Giant
Images from Orion's Arm Contributors
Rigel A, currently a B-type blue giant star
A huge, very hot, very luminous, blue post-main-sequence star; spectral type O or B. These rare, extremely hot stars burn helium. and are very rare and very bright. Blue giants are at least 18 Sol or more in mass. Examples include Rigel and Regulus.

Blue Straggler
Image from Steve Bowers
A Blue Straggler, one particular type of blue star formed by the collision of two smaller stars within a cluster
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Development Notes
Text by M. Alan Kazlev
Initially published on 08 October 2001.