Crossword Solver > Clues > Crossword-Clue HYPOTHETICAL element causing observed bright lines in spectrum of nebulae (astron.) with 8 letters

HYPOTHETICAL ELEMENT CAUSING OBSERVED BRIGHT LINES IN SPECTRUM OF NEBULAE (ASTRON.)
Crossword Clue 8 Letters

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HYPOTHETICAL element causing observed bright lines in spectrum of nebulae (astron.) with 8 letters
1 Answer

part, portion, act
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