第四百二十九章 交会对接(大家新年快乐)
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梦想号空天飞机拖曳着神舟九号,飞快地朝天空一号目标飞行器所在的轨道飞去。龙腾小说ltxsba.com
原本神舟九号若是要和天宫一号进行对接,一般都是从天宫一号的尾部跟进,天宫一号保持平稳姿态,神舟九号则通过各种微小的变轨来保持轨道,保证双方能够对接顺利。
但这一次不一样,神舟九号现在动力全失,根本没有机动变轨能力,因此,最好的办法就是让天宫一号变轨跟进,从尾部慢慢追上神舟九号,然后通过天宫一号自带的对接系统保证对接成功。
这个过程中梦想号空天飞机只需要保证神舟九号的轨道稳定就可以了。
现在最主要的因素就是时间问题。
神舟九号内的氧气最多在一小时后耗尽,如果不计算变轨等所需要的时间,真正留给陈新他们的交会对接时间只有不到二十分钟。
幸运的是,陈新和酒泉卫星发射中心的配合十分默契,在梦想号拖曳着神舟九号顺利进入天宫一号目标飞行器的轨道的时候,天宫一号在地面指挥中心的控制下,已经顺利飞到了神舟九号后方一百多公里的驻泊
这次对接营救行动中,中国国家航天局不计成本地动用了天宫一号内部仅剩的一些用于调整姿态的储备燃料,用来保证天宫一号与神舟九号的对接姿态。
原本按照计划,天宫一号与神舟九号完成对接任务后,还继续在太空中运行一到两年的时间。然后与预计将于明年升空的神舟十号宇宙飞船进行交汇对接。
但经过神舟九号的事故之后,天宫一号恐怕就得提前退役了。
不过现在几乎没人提这件事。
相比于这次营救行动的技术含量,空间交会对接任务就仿佛和小孩子过家家一样简陋了。
不过这背后有多少战忽局的因素,这次行动,恐怕都可以算得上是人类历史上难度最高的一次航天救援行动。
一般而言,航天任务中出现意外的话,结局往往都不是太好,比如火箭爆炸,比如卫星入轨失败,然后坠入地球等等。
而对载人航天任务而言。失败就是死亡。
历史上载人航天任务中发生事故已经有过好多次。
1971年6月30日。苏联就曾宣布,3名创造绕地球轨道持久航行纪录的宇航员,在“联盟”号宇宙飞船返回地球时被发现死亡。
1986年1月28日,挑战者号航天飞机升空后。因其左侧固体火箭助推器(srb)的o型环密封圈失效。毗邻的外部燃料舱在泄漏出的火焰的高温烧灼下结构失效。使高速飞行中的航天飞机在空气阻力的作用下于发射后的第73秒解体,机上7名宇航员全部罹难。
最近的一次就是哥伦比亚号航天飞机的失事,2003年2月1日美国东部时间上午9时。美国“哥伦比亚”号航天飞机在得克萨斯州北部上空解体坠毁,7名宇航员全部遇难。
唯一一次在发生重大事故之后仍然安全返回地球的就是著名的阿波罗13号登月飞船。
阿波罗13号(apollo13)是阿波罗计划中的第三次载人登月任务。发射后两天,服务舱的氧气罐发生的爆炸严重损坏了航天器,使其大量损失氧气和电力。
三位宇航员使用航天器的登月舱作为太空中的救生艇。指令舱系统并没有损坏,但是为了节省电力在返回地球大气层之前都被关闭。
三位宇航员在太空中经历了缺少电力、正常温度以及饮用水的问题,但仍然成功返回了地球。
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