保护地球，探索宇宙，发现文明
This artists’ impression is of the Mariner 10 mission. Mariner 10, which launched on Nov. 3, 1972, was the first mission to perform an interplanetary gravity assist, using a flyby of the planet Venus to alter its path to meet Mercury. This allowed the spacecraft to meet Mercury on three occasions in 1974 and 1975. 这幅艺术家画的是水手10号的任务。水手10号于1972年11月3日发射升空，...
In this image from June 2002, astronaut Franklin R. Chang-Diaz works with a grapple fixture during a spacewalk on the STS-111 mission to perform work on the International Space Station. The first spacewalk of the mission began with the installation of a power and data grapple fixture (PDGF) for the station’s robotic arm on the complex’s P6 truss....