Question

What is Light Year?

Answer 1

Definition

A light year is a unit of measuring distance. It is used to measure distance of other celestial bodies from earth.

1. A light year is the distance a beam of light travel in single earth year.
2. In $1$ second light travel $3\times {10}^{8}m$
3. In $1$ minutes or $60$second light travel$3\times {10}^8\times 60m$
4. In $1$hour or $60$ minutes light travel $3\times {10}^8\times 60\times 60=3\times {10}^8\times 3600m$
5. In $1$ day or $24$ minutes light travel $3\times {10}^8\times 3600\times 24=3\times {10}^8\times 86400m$
6. In $1$ day or $24$ minutes light travel $3\times {10}^8\times 3600\times 24=3\times {10}^8\times 86400m$
7. In $1$ year or $365$ days light travel $3\times {10}^8\times 86400\times 365=3\times {10}^8\times 31536000=94608000\times {10}^8=9.46\times {10}^{15}m$

That is $1$ light year is equal to $9.46\times {10}^{15}m$ distance