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Leonardo (ISS module) : ウィキペディア英語版
Leonardo (ISS module)

The Leonardo Permanent Multipurpose Module (PMM) is a module of the International Space Station. It was flown into space aboard the Space Shuttle on STS-133 on 24 February 2011 and installed on 1 March. Leonardo is primarily used for storage of spares, supplies and waste on the ISS, which is currently stored in many different places within the space station. The Leonardo PMM was a Multi-Purpose Logistics Module (MPLM) before 2011, but was modified into its current configuration. It was formerly one of three MPLM used for bringing cargo to and from the ISS with the Space Shuttle. The module was named for Italian polymath Leonardo da Vinci.
==Previous proposals==
A European proposal suggested equipping the ''Donatello'' MPLM with enhanced micrometeoroid and orbital debris protection and cooling systems and leaving it attached to the ISS after the Space Shuttle fleet is retired. Costs for such MPLM modifications were estimated at $20M to $40M per unit. The MPLM would then be called a Permanent Multipurpose Module (PMM), and it would house spare parts and supplies, allowing longer times between resupply missions. The proposal was rejected by NASA because it would require changes to existing plans and would entail additional costs. Internal discussions continued and managers considered the possibility of STS-133, which at that time was planned to be the last Shuttle flight, leaving its MPLM permanently attached. The United Launch Alliance also published a proposal for a system that could allow additional ISS modules to be launched on an EELV even after the retirement of the Shuttle.
On August 5, 2009 it was announced that STS-133 would indeed leave one MPLM permanently attached to the station. In October 2009, it was confirmed that ''Leonardo'' would be the MPLM converted to a PMM. It was launched on February 24, 2011. The PMM was transferred to the station using the Shuttle robotic arm and mated to the nadir (Earth) facing port of ''Unity''.
On May 27, 2015, at 13:08 UTC, the PMM was relocated from the nadir port of the ''Unity'' module to the forward-facing port of the ''Tranquility'' (Node 3) module. This was done in order to allow ''Unity'''s nadir port to serve as a berthing port for future U.S. Commercial Crew Development spacecraft.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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