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 St. Lawrence River, which is located on the Quebec border, is an important part of the Great Lakes' structure. The Great Lakes consist of six total bodies of water that are named Lake Superior, Lake Michigan, Lake Huron, Lake Ontario, Lake Erie and the Georgian Bay. The states and provinces that border these bodies of water form a unique economic and historical region, which is often referred to as the Great Lakes Megalopolis.