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天文学家发现了带有四个“太阳”的奇怪星系。_我的网站

一 | 北京时间1月16日消息，我们的太阳系有一颗恒星和八颗行星。但其他星系可能远不止这些，而且会有两三颗恒星围绕彼此运行。一组天文学家发现了一个由四颗恒星组成的星系，它隐藏在146光年之外。这个星系被命名为HD98800。天文学家利用智利的阿塔卡马大毫米阵列射电望远镜发现了它。 KABUL, Afghanistan -- The watchdog for U.S. assistance to Afghanistan has warned that the Taliban are benefiting from international aid through the establishment of fraudulent nongovernmental organizations.The Taliban have exerted greater control over national and international NGOs since seizing power in August 2021. They have barred Afghan women from NGO work and sought to push out foreign organizations from the education sector.A report from the U.S. Special Inspector General for Afghanistan Reconstruction, or SIGAR, said it found that the Taliban benefit from American-funded education programming through the generation of tax revenues and from more “nefarious” methods like the establishment of fraudulent NGOs and extorting and infiltrating existing NGOs to obtain or direct international donor aid. In May, a SIGAR report highlighted the Taliban’s interference with NGO work in Afghanistan. The Ministry of Economy, which supervises the sector, rejected the claims. Ministry spokesman Abdul Rahman Habib, responding to the latest SIGAR report on Monday, said there was no evidence of interference.According to the report, published this month, the U.S. has spent around $185 million on education in Afghanistan since August 2021.An NGO official told SIGAR that the Taliban target and extort Afghans who receive monetary support from American-funded education programs under the guise of taxation. In another example, NGO officials told the watchdog that the Taliban coerced NGOs into hiring supporters or purchasing goods from Taliban-owned companies.Taliban policies and priorities have reduced the overall quality of education, with a drop in the number of teachers and a decrease in teacher quality, as unqualified community members or Taliban officials replace staff, SIGAR said."We found that the Taliban have been unable to fully fund public school teacher salaries and building maintenance costs, leading to further teacher shortages and the deterioration of school buildings."The redirection of international donor aid to community-based education schools, along with financial and infrastructure challenges facing the Taliban, raised serious questions about how the Taliban could sustain the education sector and if they had any intention of doing so, the report said.An Education Ministry spokesman, Qari Mansor Ahmad Hamza, called the SIGAR report baseless and said the quality of teaching and school facilities in Afghanistan is better than before.“At present, the projects and financial assistance of international aid agencies are under the strong supervision of the top leadership of the Islamic Emirate of Afghanistan,” Hamza said, employing the term the Taliban use to describe their administration. The leadership promises to “invest this aid” and share reports with the country, the spokesman added.。射电望远镜是发现这个星系的关键，因为这些恒星被原行星盘所包围。据报道，最初的行星盘是指在行星形成之前出现在早期星系中的尘埃和气体环。最终，尘埃和气体会坍缩成行星，但在此之前，圆盘将阻止大部分光从星系中逃逸。然而，无线电波可以穿透灰尘。基于这一原理，科学家们利用射电望远镜在尘埃中发现了四颗独立的恒星。这四颗恒星形成了两对双星，一对在银河系的中心，另一对在数十亿英里外的轨道上。根据天文学家的说法，外对命名为aa和ab，而中心对命名为ba和bb。由四颗恒星组成的星系本身很奇怪，但真正让这个星系奇怪的是原行星盘。在大多数系统中，原始的行星盘与主星对齐。例如，在我们自己的太阳系中，所有的行星和小行星都在与太阳大致相同的平面上运动。HD98800的情况并非如此，它是一个由尘埃和气体组成的原行星盘，与中央恒星平面成直角。