网站综合信息 slashdot.org
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- 域名年龄:26年7个月17天 注册日期:1997年10月05日 到期时间:
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地址:美国 加利福尼亚州山景市Sourceforge公司
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slashdot.org
域名年龄: 26年7个月17天注册时间: 1997-10-05
注 册 商: Tucows Inc.
注册邮箱: hostmaster
联系电话: +1.8584545900
获取时间: 2017年04月22日 18:29:02
Domain Name: SLASHDOT.ORG
Registry Domain ID: D2289308-LROR
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Updated Date: 2016-09-05T03:59:45Z
Creation Date: 1997-10-05T04:00:00Z
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HTTP/1.0 301 永久重定向 目标网址:https://slashdot.org/ 连接:关闭 文件大小:0 HTTP/1.1 200 OK 服务器:Apache SLASH_LOG_DATA: shtml 缓存控制:不缓存 其他指令:不缓存 X-XRDS-Location: https://slashdot.org/slashdot.xrds 类型:text/html; charset=utf-8 访问时间:2017年04月22日 18:30:52 X-Varnish: 71723753 文件时间(秒):0 连接:keep-alive 动作:Accept-Encoding, User-Agent Content-Encoding: gzip Transfer-Encoding: chunked 网站编码:utf-8
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抓取时间:2017年04月22日 18:28:59
网址:http://slashdot.org/
标题:Slashdot: News for nerds, stuff that matters
关键字:
描述:Slashdot: News for nerds, stuff that matters. Timely news source for technology related news with a heavy slant towards Linux and Open Source issues.
主体:
网址:http://slashdot.org/
标题:Slashdot: News for nerds, stuff that matters
关键字:
描述:Slashdot: News for nerds, stuff that matters. Timely news source for technology related news with a heavy slant towards Linux and Open Source issues.
主体:
SlashdotStoriesFirehose AllPopularPollsDealsSubmitSearch SlashdotLoginorSign upTopics: DevicesBuildEntertainmentTechnologyOpen SourceScienceYROFollow us:RSSFacebookGoogle+TwitterNewsletterFollow Slashdot stories on TwitterNickname:Password:Public TerminalForgot your password?ClosebinspamdupenotthebestofftopicslownewsdaystalestupidfreshfunnyinsightfulinterestingmaybeofftopicflamebaittrollredundantoverratedinsightfulinterestinginformativefunnyunderrateddescriptivetypodupeerrorDEAL: For $25 - Add A Second Phone Number To Your Smartphone for life! Use promo code SLASHDOT25. Also, Slashdot's Facebook page has a chat bot now. Message it for stories and more. Check out the new SourceForge HTML5 Internet speed test!×90614955storyLight Sail Propulsion Could Reach Sirius Sooner Than Alpha Centauri (arxiv.org)2PostedbyBeauHDon Saturday April 22, 2017 @06:00AMfrom the point-A-to-point-B dept.RockDoctor writes: A recent proposition to launch probes to other star systems driven by lasers which remain in the Solar system has garnered considerable attention. But recently published work suggests that there are unexpected complexities to the system. One would think that the closest star systems would be the easiest to reach. But unless you are content with a fly-by examination of the star system, with much reduced science returns, you will need to decelerate the probe at the far end, without any infrastructure to assist with the braking. By combining both light-pressure braking and gravitational slingshots, a team of German, French and Chilean astronomers discover that the brightness of the destination star can significantly increase deceleration, and thus travel time (because higher flight velocities can be used). Slingshotting around a companion star to lengthen deceleration times can help shed flight velocity to allow capture into a stable orbit. The 4.37 light year distant binary stars Alpha Centauri A and B could be reached in 75 years from Earth. Covering the 0.24 light year distance to Proxima Centauri depends on arriving at the correct relative orientations of Alpha Centauri A and B in their mutual 80 year orbit for the sling shot to work. Without a companion star, Proxima Centauri can only absorb a final leg velocity of about 1280km/s, so that leg of the trip would take an additional 46 years. Using the same performance characteristics for the light sail, the corresponding duration for an approach to the Sirius system, almost twice as far away (8.58 lightyears), is a mere 68.9 years, making it (and it's white dwarf companion) possibly a more attractive target. Of course, none of this addresses the question of how to get any data from there to here. Or, indeed, how to manage a project that will last longer than a working lifetime. There are also issues of aiming -- the motion of the Alpha Centauri system isn't well-enough known at the moment to achieve the precise maneuvering needed without course corrections (and so, data transmission from there to
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