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Flexible path : ウィキペディア英語版
Flexible path
The flexible path was a set of destinations for further manned space exploration in the inner Solar System proposed in the Review of United States Human Space Flight Plans Committee of 2009 and was envisioned as alternative to the Moon-first and Mars-first approaches.
In 2010 president Barack Obama announced change in the space policy from the Moon-first approach (adopted previously under the Vision for Space Exploration and Constellation program) to a variety of destinations resembling the flexible path approach.
== Outer space exploration destinations envisioned in US space policy ==
Bold designates missions beyond Cis-lunar space.
Legend:   (style="background-color:lightblue">flyby ) — (style="background-color:none">orbit ) — (style="background-color:khaki">landing )
Current as of 2010:
* sub-orbital flights
* Low Earth Orbit - the International Space Station ''(Constellation program initial destination'')
''Flexible path'' beyond Low Earth Orbit:
* Moon flyby or orbit - for testing and development purposes
* Earth-Moon L1 - assembly complex for other missions, servicing of propellant depots or other spacecraft such as self-propulsion observatories and reusable non-reentry crew or cargo vehicles
* Earth-Sun L2 - servicing of space observatories requiring Earth shade
* Earth-Sun L1 - servicing of solar observatories or manned solar observatory ''(similar to proposal for the Apollo Applications Program)''
* Near-Earth objects ''(Constellation program third destination'')
* Mars flyby
* Moon landing ''(Constellation program second destination)''
* Mars orbit, including robotic landing and sample return
* Mars Moons
* Venus flyby or orbit〔
(HSF Final Report: Seeking a Human Spaceflight Program Worthy of a Great Nation ), October 2009, ''Review of U.S. Human Spaceflight Plans Committee'', p. 40.〕 ''(similar to proposal for the Apollo Applications Program)''
* Mars landing ''(Constellation program final destination)''
The list is ordered according to the delta-v required by the mission.

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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