He did this by relating the light-year to the Astronomical Unit â the Earth-sun distance. One Astronomical Unit, or AU, equals about 93 million miles (150 million km). Another way of looking at it: the Astronomical Unit is a bit more than 8 light-minutes in distance. A light beam takes 8 minutes to travel the 93 million miles (150 million km) from the sun to the Earth.
Lake Superior sits between Ontario, Canada and New York. Lake Ontario is mainly fed by the waters of Lake Erie, which are transported via the Niagara River. Lake Ontario drains into the St. Lawrence River. Lake Michigan is the third largest of the Great Lakes and the only one entirely within the United States.
The Great Lakes cover a total surface area of 95,000 square miles and hold about 5,500 cubic miles of water (approximately 20 percent of all the world's fresh water and more than 80 percent of the fresh water of North America).he Great Lakes include Lake Erie, Lake Huron, Lake Michigan, Lake Ontario, and Lake Superior and together form the largest group of freshwater lakes on Earth.