1光年=300000000米/秒*365天*24小时/天*60分/小时*60秒/分=9460800000000000米=9460800000000000000000000纳米1平方光年=(9.4608*10^24)^2=89.5*10^48=8.95*10^49=895000000000000000000000000000000000000000000000...