Crossword solverSynonyms for cosmic radiation7 crossword answers for “cosmic radiation” (6,9), sorted by letter count.How many letters?All73241912523413 letters 2CMBcbr4 letters 1CMBR9 letters 1radiation25 letters 2cosmic background radiation(6,10,9)cosmic microwave background(6,9,10)34 letters 1cosmic microwave background radiation(6,9,10,9)