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2024 年 4 月 24 日

龙蛋的双极瓣辐射云
影像提供与版权: Rowan Prangley

说明: 为何单颗恒星能形成这团美丽的星云呢?发射星云NGC6164的中心有颗质量异常庞大的恒星。这颗被喻为牡蛎珍珠的中心恒星,据传是受到神话中的天坛战龙 保护的龙蛋。位于此主题影像中心、编录号为HD148937的这颗恒星,是如此的炽热,因此会辐射紫外光加热周围的气体。这些气体很可能是这颗恒星先前抛出的,具体成因则可能是与另一颗绕行的伴星之间的重力作用所致。而所抛出的物质,可能受到这颗大质量恒星的磁场之引导,最后聚成形状对称的双极瓣星云。跨幅约4光年的NGC6164,座落在南天矩尺座方向约3,600光年远之处。



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2024 年 4 月 24 日

龙蛋的双极瓣辐射云
影像提供与版权: Rowan Prangley

说明: 为何单颗恒星能形成这团美丽的星云呢?发射星云NGC6164的中心有颗质量异常庞大的恒星。这颗被喻为牡蛎珍珠的中心恒星,据传是受到神话中的天坛战龙 保护的龙蛋。位于此主题影像中心、编录号为HD148937的这颗恒星,是如此的炽热,因此会辐射紫外光加热周围的气体。这些气体很可能是这颗恒星先前抛出的,具体成因则可能是与另一颗绕行的伴星之间的重力作用所致。而所抛出的物质,可能受到这颗大质量恒星的磁场之引导,最后聚成形状对称的双极瓣星云。跨幅约4光年的NGC6164,座落在南天矩尺座方向约3,600光年远之处。

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Should You Buy Bitcoin?

In general, many financial experts support their clients’ desire to buy cryptocurrency, but they don’t recommend it unless clients express interest. “The biggest concern for us is if someone wants to invest in crypto and the investment they choose doesn’t do well, and then all of a sudden they can’t send their kids to college,” says Ian Harvey, a certified financial planner (CFP) in New York City. “Then it wasn’t worth the risk.” The speculative nature of cryptocurrency leads some planners to recommend it for clients’ “side” investments. “Some call it a Vegas account,” says Scott Hammel, a CFP in Dallas. “Let’s keep this away from our real long-term perspective, make sure it doesn’t become too large a portion of your portfolio.” In a very real sense, Bitcoin is like a single stock, and advisors wouldn’t recommend putting a sizable part of your portfolio into any one company. At most, planners suggest putting no more than 1% to 10% into Bitcoin if you’re passionate about it. “If it was one stock, you would never allocate any significant portion of your portfolio to it,” Hammel says.

Tata Power whose core business is to generate, transmit and distribute electricity has made no money to investors in the last one decade. That is a big blunder considering it is one of the largest power generation companies in the country. One of the reasons is the company's huge debt levels which stood at ₹43,559 crore at the end of March 2021 compared to the company’s market capitalisation of ₹44,447 crore.

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