Question

define light year and Express it in metre​

Answer 1

Answer:

The light-year is a unit of length used to expressastronomical distances and measures about 9.46 trillion kilometres (9.46 x 1012 km) or 5.88 trillion miles (5.88 x 1012 mi). ... Because it includes the word "year", the term light-year may be misinterpreted as a unit of time.

Answer 2

Light Year is the light traveled in one year.

• It is the unit of length used to express the astronomical unit.
• Light year is a distance that light travels in a vacuum in unit year
• The distances are vast and the light is fast.
• Light can travel 671 million miles in an hour.
• A light-year can be expressed as 3 ×$10^{8}$ m/s
• 1 light-year = 9.46×$10^{15}$ metre