carrying astronauts landing sampling. NASA considered

xinhuanet.com Washington on 19 June, (reporter Lin Xiaochun) NASA says 19 days, has selected a "strange asteroid asteroid capture plan" cheap nfl jerseys as "effective candidate", which makes American "locking" asteroid capture candidate target up to 3.

NASA said in a statement, America astronomers asteroid 2011MD was measured by the infrared space telescope is the size of Spitzer, sure it meets American "asteroid redirection task" requirements.

cheap mlb jerseys NASA says: "the near Earth Asteroid diameter of about 6 meters, its structure seems to include a large number of blank space, maybe like a heap of rubble. These data measured by Spitzer to the asteroid 2011MD to 'effective candidates' hierarchy."

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statement said, "effective candidate" refers to the volume, quality and speed of rotation can be unmanned spacecraft captured asteroids.

previously, researchers had by visible light observations of the asteroid the size of 2011MD were estimated very rough. NASA says, thermal infrared technology is much more precise measurement of Spitzer.

including 2011MD, USA currently identified 3 asteroid for capturing and exploration, the other two are 2009BD and 2013EC20, but 2013EC20 needs in 2018 January launch of the spacecraft to capture, the time may not, cheapjerseys.us may eventually be excluded. NASA says, continue searching for more potential candidate target.

America "asteroid cheap jerseys redirection task" began in 2013, is the main content in this century 20 time, using unmanned spacecraft will a target asteroid "push" stability, security of the lunar orbit, after the use of large thrust "space launch system" rocket "Orion" spacecraft launch, carrying astronauts landing sampling. NASA considered, this plan is essential to the realization of this century 30 time America manned Mars goals.