The clue "Old Carl Sagan series" last appeared in the Premier Sunday King Feature Syndicate crossword on May 29, 2016. The correct answer for this puzzle is "COSMOS", a 6-letter word.
Solution COSMOS is 6 letters long. So far we haven´t got a solution of the same word length.
There is 1 solutions. The longest is COSMOS with 6 letters, and the shortest is COSMOS with 6 letters.
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The solution is 6 letters long.