Notice: file_put_contents(): Write of 7864 bytes failed with errno=28 No space left on device in /var/www/tg-me/post.php on line 50 Solidot 纯净版 | Telegram Webview: SolidotR/2063 -
天文学家运用哈勃太空望远镜，透过观测天王星极光的旋转运动测定其内部自转速率，精确度比过去的推算提升了一千倍。这项突破性的成果，为未来行星科学研究奠定了关键的新基准。行星的自转周期是理解其内部结构与磁场的重要基础，但对于像天王星这样遥远的天体而言，准确掌握其自转速率极具挑战性。为了解决这项难题，天文学家发展出一项崭新技术：透过观测天王星极光的旋转运动来推算其自转速率。这些极光是高能粒子流入天王星磁极区域，与上层大气互动后所产生的发光现象。研究团队分析了哈勃望远镜自 2011 年以来超过十年的紫外线极光观测资料，建立出磁场模型，并成功比对极光与磁极位置的时间变化，从而推算出天王星完整自转一圈的时间为 17 小时 14 分 52 秒，比 1986 年 NASA 航海家二号飞掠时的估计值多出 28 秒，精确度也提升了一千倍。 Nature Astronomy:A new rotation period and longitude system for Uranus 天文館:哈伯測量天王星自轉速率，精確度提升千倍
天文学家运用哈勃太空望远镜，透过观测天王星极光的旋转运动测定其内部自转速率，精确度比过去的推算提升了一千倍。这项突破性的成果，为未来行星科学研究奠定了关键的新基准。行星的自转周期是理解其内部结构与磁场的重要基础，但对于像天王星这样遥远的天体而言，准确掌握其自转速率极具挑战性。为了解决这项难题，天文学家发展出一项崭新技术：透过观测天王星极光的旋转运动来推算其自转速率。这些极光是高能粒子流入天王星磁极区域，与上层大气互动后所产生的发光现象。研究团队分析了哈勃望远镜自 2011 年以来超过十年的紫外线极光观测资料，建立出磁场模型，并成功比对极光与磁极位置的时间变化，从而推算出天王星完整自转一圈的时间为 17 小时 14 分 52 秒，比 1986 年 NASA 航海家二号飞掠时的估计值多出 28 秒，精确度也提升了一千倍。 Nature Astronomy:A new rotation period and longitude system for Uranus 天文館:哈伯測量天王星自轉速率，精確度提升千倍
BY Solidot 纯净版
Warning: Undefined variable $i in /var/www/tg-me/post.php on line 283
Telegram is a cloud-based instant messaging service that has been making rounds as a popular option for those who wish to keep their messages secure. Telegram boasts a collection of different features, but it’s best known for its ability to secure messages and media by encrypting them during transit; this prevents third-parties from snooping on messages easily. Let’s take a look at what Telegram can do and why you might want to use it.
The SSE was the first modern stock exchange to open in China, with trading commencing in 1990. It has now grown to become the largest stock exchange in Asia and the third-largest in the world by market capitalization, which stood at RMB 50.6 trillion (US$7.8 trillion) as of September 2021. Stocks (both A-shares and B-shares), bonds, funds, and derivatives are traded on the exchange. The SEE has two trading boards, the Main Board and the Science and Technology Innovation Board, the latter more commonly known as the STAR Market. The Main Board mainly hosts large, well-established Chinese companies and lists both A-shares and B-shares.
