Introduction
This year marks the fifty sixth anniversary of NASA and a series of other half-century commemorations of some of the first milestones of the organization in terms of space flight. The fiftieth anniversary of the first landing on the moon, marked in 2009, was a reminder of the strides taken by man, particularly by the United States in terms of space travel. What was once only a fantasy, human travel into space and other worlds, is part of man’s proud history. The question now is: what lies in the future? In spite of the exciting accomplishments made by man, there are ...
