Question

1. Define one light year.

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Answer 1

$\bf\huge\underline{Answer :-}$

• One light year is the distance travelled by light in one year.

• It is used to measure astronomical measures and distances.

• Light year is a unit of length.

• The measure of one light year is 9.46 × 10¹² km

• The symbol of light year is ly

• Other unit used to measure astronomical distance is parsec.

Answer 2

Answer:

Explanation:

Answer:

A light-year is a unit of distance. It is the distance that light can travel in one year. Light moves at a velocity of about 300,000 kilometers (km) each second. So in one year, it can travel about 10 trillion km. More p recisely, one light-year is equal to 9,500,000,000,000 kilometers