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银河系中心的人马座C（Sagittarius C）是一处物质丰富的恒星育婴室，却长期以来呈现异常低的恒星形成率。天文学家利用韦伯太空望远镜的观测资料推测，该区域中的强磁场可能是抑制恒星形成的主因。人马座C距离银河系中心的超大质量黑洞约 200 光年，是银河中心附近一个重要的恒星形成区域。这里拥有大量高密度的气体与尘埃，理论上应能有效孕育众多恒星，然而实际观测却显示，当地的恒星形成率远低于预期。透过韦伯太空望远镜的红外线观测，天文学家得以穿透稠密的尘埃，窥见银河中心附近的恒星诞生现场。韦伯的影像中，人马座C周围可见大量细长的丝状结构。这类结构过去曾由地面望远镜观测到，韦伯望远镜的资料则提供了更清晰的画面与有力的佐证。研究团队推测，这些丝状结构的形成与当地强磁场密切相关。银河系中央黑洞所产生的强大潮汐力使气体剧烈流动，进而拉伸并增强周围的磁场，而磁场则进一步形塑出这些丝状结构。 NASA Webb Explores Effect of Strong Magnetic Fields on Star Formation 天文館:銀河中心強磁場可能抑制恆星誕生
银河系中心的人马座C（Sagittarius C）是一处物质丰富的恒星育婴室，却长期以来呈现异常低的恒星形成率。天文学家利用韦伯太空望远镜的观测资料推测，该区域中的强磁场可能是抑制恒星形成的主因。人马座C距离银河系中心的超大质量黑洞约 200 光年，是银河中心附近一个重要的恒星形成区域。这里拥有大量高密度的气体与尘埃，理论上应能有效孕育众多恒星，然而实际观测却显示，当地的恒星形成率远低于预期。透过韦伯太空望远镜的红外线观测，天文学家得以穿透稠密的尘埃，窥见银河中心附近的恒星诞生现场。韦伯的影像中，人马座C周围可见大量细长的丝状结构。这类结构过去曾由地面望远镜观测到，韦伯望远镜的资料则提供了更清晰的画面与有力的佐证。研究团队推测，这些丝状结构的形成与当地强磁场密切相关。银河系中央黑洞所产生的强大潮汐力使气体剧烈流动，进而拉伸并增强周围的磁场，而磁场则进一步形塑出这些丝状结构。 NASA Webb Explores Effect of Strong Magnetic Fields on Star Formation 天文館:銀河中心強磁場可能抑制恆星誕生
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The global forecast for the Asian markets is murky following recent volatility, with crude oil prices providing support in what has been an otherwise tough month. The European markets were down and the U.S. bourses were mixed and flat and the Asian markets figure to split the difference.The TSE finished modestly lower on Friday following losses from the financial shares and property stocks.For the day, the index sank 15.09 points or 0.49 percent to finish at 3,061.35 after trading between 3,057.84 and 3,089.78. Volume was 1.39 billion shares worth 1.30 billion Singapore dollars. There were 285 decliners and 184 gainers.
Should I buy bitcoin?
“To the extent it is used I fear it’s often for illicit finance. It’s an extremely inefficient way of conducting transactions, and the amount of energy that’s consumed in processing those transactions is staggering,” the former Fed chairwoman said. Yellen’s comments have been cited as a reason for bitcoin’s recent losses. However, Yellen’s assessment of bitcoin as a inefficient medium of exchange is an important point and one that has already been raised in the past by bitcoin bulls. Using a volatile asset in exchange for goods and services makes little sense if the asset can tumble 10% in a day, or surge 80% over the course of a two months as bitcoin has done in 2021, critics argue. To put a finer point on it, over the past 12 months bitcoin has registered 8 corrections, defined as a decline from a recent peak of at least 10% but not more than 20%, and two bear markets, which are defined as falls of 20% or more, according to Dow Jones Market Data.
