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21.
The LISA Pathfinder Mission 总被引:1,自引:0,他引:1
LISA Pathfinder, formerly known as SMART-2, is the second of the European Space Agency’s Small Missions for Advance Research and Technology, and is designed to pave the way for the joint ESA/NASA Laser Interferometer Space Antenna (LISA) mission, by testing the core assumption of gravitational wave detection and general relativity: that free particles follow geodesics. The new technologies to be demonstrated in a space environment include: inertial sensors, high precision laser interferometry to free floating mirrors, and micro-Newton proportional thrusters. LISA Pathfinder will be launched on a dedicated launch vehicle in late 2011 into a low Earth orbit. By a transfer trajectory, the sciencecraft will enter its final orbit around the first Sun-Earth Lagrange point. First science results are expected approximately 3 months thereafter. Here, we give an overview of the mission including the technologies being demonstrated. 相似文献
22.
Giuseppe G. Reibaldi 《Space Policy》1996,12(1):9-11
Italy initiated space activities in the late 1950s; however, it was only in the 1980s that these activities grew to the point where Italy became a major spacefaring nation. In 1988, the Italian Space Agency was created with the goal of coordinating all Italian space activities, but severe administrative and organizational difficulties hampered its operation. This viewpoint proposes a new space policy-making process, in view of the increased effectiveness that space activities can bring to various departments of the Italian government and to allow it to better exploit investments in space activities. 相似文献