spectroscopic binary

20 LETTERS · STARTS WITH S

spectroscopic binary is a valid 20-letter word worth 34 points in Scrabble and 40 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS

S1P3E1C3T1R1O1S1C3O1P3I1C3B3I1N1A1R1Y4

1 + 3 + 1 + 3 + 1 + 1 + 1 + 1 + 3 + 1 + 3 + 1 + 3 + 0 + 3 + 1 + 1 + 1 + 1 + 4 =34 PTS

DOUBLE WORD → 68TRIPLE WORD → 102

MEANING

What does spectroscopic binary mean?