The word extragalactic is playable in Words With Friends™, no blanks required. Because it is longer than 7 letters, you would have to play off an existing word or do it in several moves.
Words With Friends™ Letter Score: 29
Highest Scoring Words With Friends™ Play In The Letters extragalactic
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Seven Letter Word Alert: (24 words)
agitate, article, calcite, cartage, cattail, cattier, circlet, citrate, clatter, clitter, extract, glacier, glitter, gracile, lactate, lattice, rattail, recital, regalia, regatta, tactile, teacart, tertial, triaxle