42 light year to light second conversion result above is displayed in three different forms: as a decimal (which could be rounded), in scientific notation (scientific form, standard index form or standard form in the United Kingdom) and as a fraction (exact result). Every display form has its own advantages and in different situations particular form is more convenient than another. For example usage of scientific notation when working with big numbers is recommended due to easier reading and comprehension. Usage of fractions is recommended when more precision is needed.
If we want to calculate how many Light Seconds are 42 Light Years we have to multiply 42 by 31557600 and divide the product by 1. So for 42 we have: (42 × 31557600) ÷ 1 = 1325419200 ÷ 1 = 1325419200 Light Seconds
So finally 42 light year = 1325419200 light second
