“挑战者”号航天飞船飞行成功后,美国宇航局科学顾问委员会又提出了一项新的探索行星计划。这个计划分两个部分:对现有绕地球飞行的飞船作出改进,并用于向离地球较近的行星的飞行;研制一种能飞到离地球较远行星上去的宇宙飞船。 Following the successful flight of Challenger spacecraft, NASA’s Scientific Advisory Board has proposed a new exploration planet plan. The plan is divided into two parts: the improvement of the existing spacecraft flying around the Earth and its application to the planets closer to Earth; and the development of a spacecraft capable of flying further away from the Earth.