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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

A | 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。    LOS ANGELES -- A U.S. Navy sailor charged with providing sensitive military information to China pleaded guilty in Los Angeles on Tuesday to conspiring with a foreign intelligence officer and receiving a bribe, federal prosecutors said. Petty Officer Wenheng Zhao, 26, originally pleaded not guilty when he was charged Aug. 4. The Justice Department alleges that Zhao, based at Naval Base Ventura County, north of Los Angeles, conspired to collect nearly $15,000 in bribes from a Chinese intelligence officer in exchange for information, photos and videos of involving Navy exercises, operations and facilities.The information included plans for a large-scale U.S. military exercise in the Indo-Pacific region, which detailed the location and timing of naval force movements, prosecutors said. The Chinese officer told Zhao the information was needed for maritime economic research to inform investment decisions, according to the indictment.Zhao, who also went by the name Thomas Zhao and held a U.S. security clearance, “admitted he engaged in a corrupt scheme to collect and transmit sensitive U.S. military information to the intelligence officer in violation of his official duties,” the U.S. Attorney's Office said in a news release Tuesday. Zhao, of Monterey Park, California, faces a statutory maximum penalty of 20 years in federal prison. He has been in custody since his arrest on Aug. 3.Zhao was charged on the same day as another California-based Navy sailor who is accused of similar crimes. But they are separate cases, and federal officials haven't said if the two were courted or paid by the same Chinese intelligence officer as part of a larger scheme. Jinchao Wei, a 22-year-old assigned to the San Diego-based USS Essex, is charged with providing detailed information on the weapons systems and aircraft aboard the Essex and other amphibious assault ships that act as small aircraft carriers. He pleaded not guilty in federal court in San Diego. Last week, a former U.S. Army intelligence officer was charged in Seattle with attempting to provide classified defense information to the Chinese security services during the outbreak of the COVID-19 pandemic. Sgt. Joseph Daniel Schmidt, 29, was arrested Oct. 6 at San Francisco International Airport as he arrived from Hong Kong, where he had been living since March 2020, the Justice Department said. A federal grand jury returned an indictment charging him with retention and attempted delivery of national defense information. U.S. District Court records in Seattle did not yet list an attorney representing Schmidt on the charges, and neither the U.S. attorney’s office nor the federal public defender’s office had information about whether he had a lawyer.An FBI declaration filed in the case quoted Schmidt as telling his sister in an email that he left the U.S. because he disagreed with unspecified aspects of American policy.。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。

B | 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。

C | 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。

D | 恒星系是人类发现的第一个具有这种垂直圆盘的双星系统，这表明宇宙中有许多未知现象等待发现。此外，最初的行星盘通常最终形成行星，这意味着以各种奇怪的角度围绕二元系运行的行星可能会出现。我们通常不从这些奇怪的角度寻找行星，因此这表明人类可以在未来探索这些行星。

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Published on:18:06:07