Answer: 18.92 trillion kilometers
Explanation:
One light year is the distance traveled at the speed of light in one year.
Speed of light in vacuum = [tex]3\times 10^8m/s[/tex]
Thus distance traveled by light in one year = [tex]3\times 10^8\times 60\times 60\times 24\times 365=9.46\times 10^15m[/tex]
Hence, distance traveled in two years =[tex]2\times 9.46\times 10^15=1.89\times 10^{16}m=18.92\times 10^{12}km=18.92 trillionkm[/tex]
(1km=1000m) [tex](1trillion=10^{12})[/tex]
