作者：侯华扁 来源：原创 发布日期：08-25
A | One of the largest black hole jets in the sky has been uncovered by astronomers at Western Sydney University, new research published in the journal Monthly Notices of the Royal Astronomical Society has revealed.,According to the paper, in terms of distance from Earth, the galaxy NGC2663 is close by at just 93 million light-years.,With nearly ten times as many stars as our own Milky Way, it has the recognizable oval shape of a "typical" elliptical galaxy when viewed through a standard telescope. Led by astronomer Velibor Velovic of Western Sydney University, the research team used CSIRO's Australian Square Kilometre Array Pathfinder (ASKAP), a system of 36 connected radio dishes acting as a single super-telescope in Western Australia, to make their findings.,A core black hole's jet of material is visible in the radio waves as it leaves the galaxy. If our eyes could see it in the night sky, it would be larger than Earth's moon. This powerful torrent of material is approximately 50 times larger than the galaxy, stretched over almost 1 million light-years, according to the research.,The process studied by the scientists is rather similar to an effect seen in jet engines. The surrounding pressure pushes the exhaust plume from the sides as it rockets through the vacuum. As a result, the jet pulsates while expanding and contracting. Regular bright spots in the jet, called "shock diamonds" due to their shape, were observed by the team.,The flow glows brighter as it constricts.,Shock diamonds have been observed in smaller, galaxy-sized jets as well as in jet engines. Jets have been observed slamming into dense gas clouds, illuminating them as they pass through. However, a more subtle effect that makes it more difficult to see is the restriction of jets from the sides.,The paper underscored that astronomers have not observed this effect on such massive scales before NGC2663. This reportedly demonstrates that NGC2663 is surrounded by enough matter to push against the sides of the jet. The substance is then heated and pressurized by the jet.,A feedback loop is created when intergalactic matter enters a galaxy, which then creates a black hole that releases a jet. In turn, the jet decreases the inflow of intergalactic matter into galaxies. As the universe expands, these jets have an impact on how gas condenses into galaxies.,The Evolutionary Map of the Universe survey, which is also credited with discovering a new category of enigmatic astronomical object known as a "Odd Radio Circle," is still scanning the space.,‘Best Physical Models Can’t Fit The Data’: Radio Bursts Detected in Space ‘Defy’ Existing Theories7 August, 14:45 GMT。 8 月 25 日消息，苹果宣布，将放弃变更 iCloud+“隐藏邮件地址”（Hide My Email）域名，相关网站将继续使用 icloud.com 域名。注意到，苹果这一决定距离最初公布调整方案仅约两个月。在今年 6 月时，苹果曾宣布将为“通过 Apple 登录”（Sign in with Apple）和“隐藏邮件地址”启用统一的新邮箱域名 private.icloud.com。
B | 作为参考，目前“通过 Apple 登录”使用 privaterelay.appleid.com，而“隐藏邮件地址”则与普通 iCloud 邮箱一样使用 icloud.com。不过苹果相应公告引发争议，原因在于许多用户认为 privaterelay.appleid.com 反而不如 icloud.com 保护隐私，这是因为 icloud.com 本身同时用于普通 iCloud 邮箱，使网站难以单独通过域名屏蔽“隐藏邮件地址”地址。如果改用独立的 private.icloud.com，平台就更容易识别并封禁这类隐私匿名邮箱，从而影响不愿提供真实邮箱地址的用户。苹果此次在开发者公告中表示，在进一步考虑并听取社区反馈后，决定让 iCloud+“隐藏邮件地址”地址继续使用 icloud.com，不再实施此前公布的域名迁移计划。不过，“通过 Apple 登录”仍将按照原计划调整。苹果表示，从今年晚些时候开始，新生成的“通过 Apple 登录”地址将使用 private.icloud.com，此前已经分配的 privaterelay.appleid.com 地址则会继续正常工作，并持续为用户转发邮件，不会受到影响。苹果同时建议开发者调整相关账户系统、邮箱验证逻辑和允许列表，同时支持 private.icloud.com 与现有的 privaterelay.appleid.com 域名。
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