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href="/bxsh/">百姓生活</a> > 内容</p> </div> <div class="xxy_main"> <h3 style="">NASA提三方案阻止小行星撞击地?/h3> <p class="comeFrom">仙居新闻?  发布时间?018-06-27   字体:?a onClick="doZoom(16)" style="cursor:hand"><u>?/u></a> <a onClick="doZoom(14.8)" style="cursor:hand"><u>?/u></a> <a onClick="doZoom(12)" style="cursor:hand"><u>?/u></a>?/p> <div class="xxy_fx" align="center"> <!-- JiaThis Button BEGIN --> <div class="jiathis_style"> <a class="jiathis_button_qzone">QQ空间</a> <a class="jiathis_button_tsina">新浪微博</a> <a class="jiathis_button_tqq">腾讯微博</a> <a class="jiathis_button_weixin">微信</a> <a class="jiathis jiathis_txt jiathis_separator jtico jtico_jiathis" target="_blank">更多</a> </div> <!-- JiaThis Button END --> </div> <div id="zoom" class="text"> <p><div class="ycfz"> <span style="font-size: 12px;">  据英国《新科学家》网站近日报道,虽然巨大小行星撞向地球的可能性很小,但美国国家航空航天局(NASA)正在制定计划,研究如何探测并阻止这一灾难。NASA计划在未?0年设计并测试摧毁撞向地球的小行星的方案,比如改变其撞向地球的轨道?/span><br />  </div> <div class="ycfz">   NASA发布报告称,根据来袭小行星的大小及撞击前可能容许的预警时间,?种技术方案可用:引力牵引器、动能冲击器以及核装置?br />  </div> <div class="ycfz">   第一种方案引力牵引器,是一种在小行星附近逡巡的重型航天器,其引力可以拖拽小行星,使其偏离原定轨道?br />  </div> <div class="ycfz">   NASA行星防御协调办公室的林德?middot;约翰逊近日在新闻发布会上说:“如果航天器能够从小行星表面收集巨石等重物,以加强引力作用,那么上述方法可以被强化?rdquo;<br />  </div> <div class="ycfz">   另一个方案是利用所谓的动能冲击器。这种航天器会故意撞向小行星,从而改变其速度和轨道。约翰逊说,这一方法将在2021年夏天启动的“NASA双小行星重定向测?rdquo;任务中进行试验?br />  </div> <div class="ycfz">   第三个方案是用核装置对抗来袭的小行星,使其转向,或将其炸成非常微小的碎片,这些小碎片会在穿越大气层时燃烧殆尽?br />  </div> <div class="ycfz">   NASA在报告中说,他们打算制定任务计划,利用无害的近地物体,对引力牵引器和动能冲击器技术进行飞行演示?br />  </div> <div class="ycfz">   NASA还在与美国联邦紧急措施署(FEMA)合作,为应对灾难做准备,向小行星可能袭击的地方的人们发出警告,如果发生意外,启动应急措施?br />  </div> <div class="ycfz">   此外,NASA也与全球的地基望远镜合作,探测并追踪近地物体。这些数据会被发送至国际小行星预警网和联合国外层空间事务处,该机构会向可能受到小行星撞击的国家发出警告?/div> <div class="ycfz">  </div> <div class="ycfz">                      </div> </p> </div> <div class="xxy_fx" align="center"> <!-- JiaThis Button BEGIN --> <div class="jiathis_style"> <a 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