I guess it is natural human curiosity to attempt to get the answers to all these questions and since none are immediately available this is one topic that is going to be discussed forever. (religion.blogs.cnn.com)
Perhaps it was begun in the name of whatever god that culture believed in, but good, old fashioned human curiosity is the driving force of discovery. (religion.blogs.cnn.com)
Aside from human curiosity, military agencies use the information for navigation. (sciencenewsforstudents.org)