optical double star

19 LETTERS · STARTS WITH O

optical double star is a valid 19-letter word worth 24 points in Scrabble and 30 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS

O1P3T1I1C3A1L1D2O1U1B3L1E1S1T1A1R1

1 + 3 + 1 + 1 + 3 + 1 + 1 + 0 + 2 + 1 + 1 + 3 + 1 + 1 + 0 + 1 + 1 + 1 + 1 =24 PTS

DOUBLE WORD → 48TRIPLE WORD → 72

MEANING

What does optical double star mean?