2021，围观小行星去！(2/2)
概述：美国宇航局人员称，最早至2021年，人类有望探访近地小行星。hints:
NASA
Space Launch System
Orion
Gerstenmaier
国际空间站和地球是专有N，请大写
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http://t1.g.hjfile.cn/listen/201306/201306230532333841953.mp3A successful mission would show that humans can alter an asteroid's path, and be useful if one is found to be a danger to Earth.
NASA says there is no threat to our planet if something goes wrong during this capture mission, because an asteroid this size would disintegrate before it struck the planet.
Gerstenmaier says lunar orbit is stable enough that the asteroid possibly could stay in place for a century.
"So once we get the spacecraft and the object in this orbit, it's there for us to go visit multiple times in the future."
Astronauts could use the Space Launch System and Orion space capsule that are being developed. Space explorers could spend about five days near the asteroid and venture out of the Orion capsule to collect samples that would be returned to Earth.
Gerstenmaier says this will give astronauts and mission control experience working in deep space, far from Earth and the International Space Station.
"In this case, we're gonna have to make sure we have the right abort scenarios, the right redundancy in place, that we can tolerate being in a situation for up to five days. So that helps us take a step towards the bigger missions we wanna do going forward."
Bigger missions such as a manned voyage to Mars in the 2030s.一次成功的任务将说明，人类可以改变一颗小行星的运行轨道，也将使本对地球有危险的行星为我们所用。
美国宇航局表示，如果在捕捉小行星的过程中出了差错，对地球不会产生威胁，因为这个大小的小行星在撞击地球前就会崩裂。
格斯登迈尔说，绕月轨道足够稳定，小行星可能会在该轨道待上100年。＂因此，一旦我们将航天飞船和目标行星引入该轨道，在未来，我们就可以多次登陆。＂
宇航员可以利用正在开发的太空发射系统和猎户座飞船。太空勘探者们能在小行星附近待上大约五天并冒险飘出飞船来采集带回地球的样本。
格斯登迈尔说，这将为宇航员和航天地面指挥中心提供在深太空，即远离地球和国际空间站工作的经历。＂在这种情况下，我们将不得不确认我们有正确的中止方案，和适度准备就绪的冗余，这样我们才能在一种情况下坚持至五天。因此，这项计划帮助我们向想要向前推进的目标迈进了一步。例如，像到2030年载人登陆火星的更大任务。
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