Crossword Clue:

VIGINTILLION ten to the power of 63

AnswerCrossword Clue
ENGLISHCHANNELWhat the 63-Across crossed to begin her 88-/13-Down
ONEAny nonzero number raised to the power of zero
NTHTo the ... power
GIGAPrefix denoting 10 to the ninth power
ONEAny nonzero number to the zeroth power
TERAComputer prefix meaning 2 to the 40th power
ARTICLEIIt gives Congress the power to declare war