Question

defanation of lightyear​

Answer 1

Answer:

Psychology is the scientific study of the mind and behavior, according to the American Psychological Association. Psychology is a multifaceted discipline and includes many sub-fields of study such areas as human development, sports, health, clinical, social behavior and cognitive processes.

Answer 2

1 light year = distance travelled by light rays in one year
According to IAU 1 light year = 365.25 days