A light year is a unit of astronomical distance that measures how far light can travel in one year, defined as 365.25 days, which is about 9.4507 x 1012, or about 5.878 trillion miles. A parsec isa unit of astronomical distance, equal to about 3.26 light years. Write a function to convert parsecs to light years. (7 points ). 5. A light year is a unit of astronomical distance that measures how far light can travel in one year, defined as 365.25 days, which is about 9.4507 x 1012, or about 5.878 trillion miles. A parsec isa unit of astronomical distance, equal to about 3.26 light years. Write a function to convert parsecs to light years. (7 points ). 5