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'Magpie Bridge') relay satellite on 20 May 2018 to a halo orbit around the Earth–Moon L 2 point. [32] [33] [34] The relay satellite is based on the Chang'e 2 design, [35] has a mass of 425 kg (937 lb), and it uses a 4.2 m (14 ft) antenna to receive X band signals from the lander and rover, and relay them to Earth control on the S band. [36]
Normally closed mercury relay, with coil around top of tube and adjustable angle. A mercury relay (mercury displacement relay, mercury contactor) is a relay that uses mercury as the switching element. They are used as high-current switches or contactors, where contact erosion from constant cycling would be a problem for conventional relay contacts.
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Ranger 3 (P-34) Ranger 3: 26 January 1962: Atlas LV-3 Agena-B: NASA: Impactor: Spacecraft failure Ranger 3 lander: Lander: Spacecraft failure Partial launch failure due to guidance problem; attempt to correct using spacecraft's engine resulted in it missing the Moon by 36,793 kilometres (22,862 mi). [19] [20] 19: Ranger 4 (P-35) Ranger 4: 23 ...
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A lighter, less protected vehicle, more akin to the LRPV—the Polaris Defense DAGOR (Deployable Advanced Ground Off-road)—was being trialled in 2015. [230] Motorcycles are also used for long range strategic reconnaissance seeing service in Afghanistan. [231] Polaris six-wheel all-terrain vehicles are also used, seeing service in Afghanistan.
The first flight contracted by NASA, COTS Demo Flight 1, took place on 8 December 2010, demonstrating a Dragon capsule's ability to remain in orbit, receive and respond to ground commands, and communicate with NASA's Tracking and Data Relay Satellite System.
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