a light-year is a unit of?

Question – a light-year is a unit of? Answer: A light-year is a unit of distance used in astronomy. A light-year is a distance that light travels in one year, approximately 9.5 trillion miles (15 trillion km). It was first defined by Isaac Newton and then redefined by James Bradley in 1728 as the distance … Read more

How many centimeters in an inch?

Question: how many centimeters in an inch? Answer: There are 2 different units used to measure the length: The inch and the centimeter. In order to find out how many centimeters in an inch, you need to convert the number of inches into centimeters first. For example, if you want to know how many centimeters … Read more