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posted in Discovery read more

@白色公羊 @ArturiaPendragon 你们啊,naive

posted in Discovery read more

:bubble_funny: 实际上,还有这句话:
从1995年酝酿选址至今,FAST已经历20年时间。与被评为人类20世纪10大工程之首的美国Arecibo300米望远镜相比,FAST的综合性能提高约2.25倍。
FAST建成后能将中国空间测控能力由月球延伸到太阳系外缘,把深空通讯数据下行速率提高几十倍,对于科学家一直寻找的地外文明,FAST也将提供一个全新平台。作为世界最大的单口径望远镜,FAST将在未来20至30年保持世界一流设备的地位。

:bubble_funny: 但是,因为还没完工,我觉得这样直接说有违和感,还是完工后再说吧

posted in Discovery read more

:bubble_funny: 嗯没错!(脑补战地4语音),就是战地4 广播中心,不过广播中心原型是阿雷西博天文台,当时这个还没有建成。

Excited
:bubble_funny: :bubble_funny: 嗯,没错!是个大新闻
4月12日
:bubble_funny: 全球最大射电望远镜,在中国贵州省平塘县安装的500m 口径球面射电望远镜(FAST) 接近完工,已经完成安装4185片反射面面板,完成程度94.04%,工程进入最后阶段。
FAST
FAST,口径500米,总反射面积约25万平方米,它的圈梁被50根6-50米不等的铁柱支撑在半空中,周长1.6公里。
FAST用于汇聚无线电波供馈源接收机接收,反射面安装工程预计将于2016年5月中旬完成。
FAST

posted in Discovery read more

数据库换了,害得我重新发这个帖

posted in Discovery read more

:bubble_funny:
根据JPL(喷气推进实验室)的相关资料,如果是好奇号直链地球,其数据传输速率为500~32,000bits/s,通过基本换算,1B=8bits, 1KB=1024B, 我们很快就能算出来好奇号直链地球时候,数据传输速率范围为0.06~3.9KB/s。

如果在火星轨道运行的MRO(火星勘测轨道飞行器)卫星作为收发中继站,好奇号与MRO之间的数据传输速度可以高达200万bits/s,也就是244.1KB/s。

而还有个在火星轨道运行的Odyssey orbiter(奥德赛火星探测器)与好奇号之间的传输速率是可选择的128,000或256,000bits/s,也就是15.6~31.3KB/s。

只有当这些卫星靠近好奇号上空,才有8分钟的窗口期用来上传数据到卫星上面去。在此期间,大概有100 ~ 250 Mb (千万看清楚了,不是我们日常使用中熟悉的MB,是Mb哦) 数据会被上传,换算成MB,也就是我们常说的多少多少兆,就是有12.5~31.25MB的数据会被上传到卫星,然后呢,31.25MB的数据将花费卫星最高20小时的时间来全部传输到地球。好奇号每天最多只能传个把小时的数据直链到地球,因为传输数据是个费电的活,好奇号每天还有好多科研项目的任务要完成,所以不可能把电力和时间到耗费在直链传输数据回地球上面。

NASA吧吧主!:bubble_funny: http://tieba.baidu.com/p/4112166195
转载注明贴吧链接

顺便好奇号车轮的磨损
0_1460434359098_upload-16ae5ca8-76da-45f7-a8b1-13d35f42d7b1
0_1460434410613_upload-e9e25514-7773-4c5e-bada-14debe7f9477
0_1460434451720_upload-83a3300e-601f-46d8-b426-4df0d41e044a
0_1460434504856_upload-8a1091b6-15e8-4590-ad47-2ff873260427
轮子明显受损,有些车轮受损严重
0_1460434565714_upload-7d660446-a18e-408b-aa46-9a391f209018
这个轮子是一个石头刺破的,2012年8月登陆火星到现在,有很多磕磕碰碰的损伤,不过目前并不影响执行任务。
0_1460434616533_upload-e24d55f7-0cdf-4c68-a9d1-07dc11a81ae0
好奇号项目经理吉姆·埃里克森表示:“好奇号正在损坏。真是预料之外。我们知道在经过长久的行驶之后轮子上会有一些损坏,但没想到会出现这么大破损。”在最坏的情况下,被损坏的轮子可能会因为严重磨损而不能继续使用。

posted in Discovery read more

10月7日一支以色列团队宣布已成为第一个与谷歌月球XPrize大赛签约的队伍。
XPrize竞赛项目始于2007年,目前全球有超过30个团队参加比赛。
获得3000万美元方式,在月球表面移动500米并且将视频直播传回地球,团队90%资金必须私人资助,不能为政府行为。
成功后将获得3千万美金大奖。该奖项是由谷歌资助,由XPrize基金会负责具体执行。

:bubble_funny: 注意,移动500米不代表必须月球车前进500米,例如可以通过着陆后再次起飞,飞行500降落到达第二个着陆点实现移动500米。
0_1460430235345_20160412.jpg
这次宣布率先签约的SpaceIL团队来自以色列,有近20名全职员工和250名志愿者,正在开发跳跃式月球车,希望通过一次跳跃可以覆盖所需的500米距离。SpaceX 公司猎鹰9号会在2017年搭载探测器飞往月球,然后在月球表面软着陆。
0_1460430269519_upload-99b6e2e6-b254-4592-bf57-73e367afc719
谷歌月球XPrize大赛宣传片《重返月球》 @柚子木字幕组
http://www.bilibili.com/video/av3042019/

:bubble_funny: 顺便科普猎鹰9
美国太空探索技术公司(SpaceX)是一家由PayPal早期投资人埃隆·马斯克(Elon Musk)2002年6月建立的美国太空运输公司。它开发了可部分重复使用猎鹰1号和猎鹰9号运载火箭。SpaceX同时开发Dragon系列的航天器以通过猎鹰9号发射到轨道。SpaceX主要设
计、测试和制造内部的部件,如Merlin、Kestrel和Draco火箭发动机。

2008年SpaceX获得NASA正式合同。2012年10月,SpaceX龙飞船将货物送到国际空间站,开启私营航天的新时代。作为私营航空公司,SpaceX发射费用低廉已成为公司一大优势。不过为了进一步降低成本,马斯克考虑将火箭做成可回收的。目前SpaceX已经做了八次试验,可以做到升空1000米后回落原地。不过这项技术正式应用仍尚需时日。[1] 原来的总部位于加利福尼亚州的El Segundo,后来迁至内华达州的霍索恩。SpaceX放出豪言:2100年要主宰太阳系。2015年02月11日,谷歌SEC文件证实:已向SpaceX投资9亿美元。

2015年,据外媒报道,当地时间3月1日,美国SpaceX公司的猎鹰9号火箭从卡纳维拉尔角空军基地发射升空,将世界上第一批全电动通信卫星送入预定轨道。
:bubble_funny:

posted in Announcements read more

@ArturiaPendragon :bubble_squinting: 居然寫那麽久啊...

posted in Software read more

:bubble_funny: 不减速,提高下载不良视频速度?虽然我不看某些黄色视频。:bubble_funny:

posted in Announcements read more

@ArturiaPendragon :bubble_funny: ID:“妹妹月经有点咸” 你说得是这个吗?

posted in Games read more

:bubble_money:

Saber

作者: sakura-sdf
0_1460364055539_52280.jpg
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