Light travels 9.45
⋅
1
0
15
9.45⋅10
15
9, point, 45, dot, 10, start superscript, 15, end superscript meters in a year. There are about
3.15
⋅
1
0
7
3.15⋅10
7
3, point, 15, dot, 10, start superscript, 7, end superscript seconds in a year.