What is parsec? What is a light year?

The distance to a star, whose annual parallax is equal to one arc second, is called a parsec. A light year is the distance that light travels in 1 Earth year.

Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.