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type="text/css"></style> <div id="ct" class="ct2 wp cl"> <div class="mn"> <div class="bm_haa cl"> <div class="bm_h cl"> <a href="http://www.oecr.com/portal.php?mod=rss&catid=58" class="y xi2 rss" target="_blank" title="RSS">订阅</a><h1 class="xs2">文章</h1> </div></div> <div class="kjkjb"> <div class="bm vw" style="margin-bottom:0;"> <div class="h hm"> <div class="zxtoux"><img src="http://www.oecr.com/uc_server/avatar.php?uid=54876&size=small" /></div> <h1 class="ph">NASA首个行星防御任务将发射撞向小行星的航天器 </h1> <p class="xg1"> 时间：2019-1-4 10:18<a class="zz" href="home.php?mod=space&uid=54876">作者：update</a> 阅读<em id="_viewnum">(551)</em> 评论: <a href="http://www.oecr.com/portal.php?mod=comment&id=7353&idtype=aid" title="查看全部评论"><em id="_commentnum">5</em></a></p> <div class="zxfb" ><a href="http://www.oecr.com/portal.php?mod=rss&catid=58" class="y xi2 rss" target="_blank" title="RSS">订阅</a></div> </div> <!--[diy=diysummarytop]--><div id="diysummarytop" class="area"></div><!--[/diy]--> <div class="s"> <div class="ss"><div><span>导读： </span>据外媒BGR报道，技术的不断发展让科学家们可以考虑人类探索太阳系的可能性，然而也必须考虑如何保护我们的地球在这些过程中免受伤害，例如可能威胁地球的小行星。为此，美国宇航局（NASA）已经在计划第一次真正的行 ...</div> </div> <!--[diy=diysummarybottom]--><div id="diysummarybottom" class="area"></div><!--[/diy]--> <div class="d"> <!--[diy=diycontenttop]--><div id="diycontenttop" class="area"></div><!--[/diy]--> <table cellpadding="0" cellspacing="0" class="vwtb"><tr><td id="article_content"><div> 据外媒BGR报道，技术的不断发展让科学家们可以考虑人类探索太阳系的可能性，然而也必须考虑如何保护我们的地球在这些过程中免受伤害，例如可能威胁地球的小行星。为此，美国宇航局（NASA）已经在计划第一次真正的行星防御<a href="http://opticaltest.oecr.com" target="_blank" class="relatedlink">测试</a>任务。</div><div><br></div><div><p style="text-align: center;"><a href="data/attachment/portal/201901/04/101802vshhstsj0vhzh0sj.png" target="_blank"><img src="data/attachment/portal/201901/04/101802vshhstsj0vhzh0sj.png"></a></p></div><div><br></div><div> 双小行星重定向测试(DART)是一项计划任务，将把设计为“动能撞击器”的航天器直接撞向不会构成威胁的小行星，以测试未来使用类似系统避免小行星撞击的可行性。该任务计划于2020年12月至2021年5月期间启动，其目标是一个名为Didymos的 双小行星。 Didymos包括一个直径约800米的主体行星和一颗直径仅150米的较小行星。</div><div><br></div><div> 当航天器发射时，它将瞄准两个天体中较小的一个，因为NASA称较小行星的大小更符合我们对一颗威胁地球的小行星的预期。 DART航天器将以每秒约6米的速度撞击太空岩石。这种撞击将导致航天器本身完全被破坏。</div><div><br></div><div> NASA表示，这种撞击只会将较小天体移动的速度改变“百分之一”，但这仍然足以让科学家从地球上进行<a href="http://opticaltest.oecr.com" target="_blank" class="relatedlink">测量</a>。通过检测撞击对小行星路径产生的影响差异，NASA将更好地了解类似任务在未来如何通过真正危险的太空岩石发挥作用。</div><div><br></div><div style="text-align: center;"><br></div><div><p microsoft="" yahei",="" simsun;="" background-color:="" rgb(255,="" 255,="" 255);="" text-align:="" center;"="" 255);"="" style="text-align: center; word-wrap: normal; margin: 0px; padding: 0px; color: rgb(143, 143, 143); font-family: Tahoma, "Microsoft Yahei", Simsun; background-color: rgb(255, 255, 255);"><b microsoft="" yahei",="" simsun;="" word-wrap:="" normal;"="" style="word-wrap: normal;"><font size="5" color="#f00000" style="word-wrap: normal;">欢迎关注光研科技服务号</font></b></p><p microsoft="" yahei",="" simsun;="" background-color:="" 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