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Electromagnetic radiation whose velocity was first established when Ole Rømer measured it in 1676

Let's find possible answers to "Electromagnetic radiation whose velocity was first established when Ole Rømer measured it in 1676" crossword clue. First of all, we will look for a few extra hints for this entry: Electromagnetic radiation whose velocity was first established when Ole Rømer measured it in 1676. Finally, we will solve this crossword puzzle clue and get the correct word. We have 1 possible solution for this clue in our database.