blue straggler

blue straggler

noun Astronomy.
one of a small group of blue stars within a cluster that falls near the main sequence even though other stars of its color have evolved off the main sequence.

Origin:
1965–70
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Blue straggler is always a great word to know.
So is sidereal. Does it mean:
determined by or pertaining to the stars
the movement or path of the earth or a heavenly body turning on its axis
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