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书名:阿甘正传|作者:笑无语|本书类别:古言|更新时间:07:19:08|字数:3896字

一 |     

Miami Mayor Francis Suarez spent months struggling to get the campaign donations, attention and support he needed to keep his long-shot quest for the Republican presidential nomination alive.
That ended Tuesday, when Suarez announced he would be suspending his campaign, making him the first Republican to drop out of a nomination contest that is both crowded and heavily favoring former President Donald Trump.
“While I have decided to suspend my campaign for President, my commitment to making this a better nation for every American remains," Suarez said in a statement.
“I look forward to keeping in touch with the other Republican presidential candidates and doing what I can to make sure our party puts forward a strong nominee who can inspire and unify the country, renew Americans’ trust in our institutions and in each other, and win.”
Suarez did not offer his endorsement to any of the remaining candidates.
Suarez failed to make the debate stage in Milwaukee, despite having reached, he claimed, the threshold for 40,000 individual donors. In his quest to get more donations, Suarez offered people a chance to get front-row seats to see legendary Argentine soccer player Lionel Messi in his first game playing for Inter Miami.
But with dismal polling numbers – the last three major surveys had Suarez with zero support of GOP primary voters – Suarez did not qualify for the debate stage. While campaigning in New Hampshire weeks ago, Suarez said that candidates who did not meet the thresholds for the Milwaukee debate should drop out.
As the only Hispanic in the GOP presidential race, Suarez – the 45-year-old son of Miami's first Cuban-born mayor – at first appeared to be someone who could build on the party's inroads among Latino voters. Exit polls show that Hispanics – especially in Republican Florida – are moving more toward the GOP, although Democrats still hold a commanding lead among the voter group nationally and in battleground states like Arizona and Colorado.
Suarez was also an early proponent of vaccinations for COVID-19. He has clashed with his state's GOP governor, Ron DeSantis, criticizing his foe for the GOP presidential nomination for the expansion of the "don’t say gay" law in schools and the handling of the slavery curriculum in classrooms.
Nor has Suarez been a reliable enemy of President Joe Biden. At an event at the White House in early 2021, Suarez said he spoke with the president about the pandemic and climate change, adding that he had more communication with the Democratic president than with Trump, when he was president.
"I've spoken to the president and vice president more times in the short period that they have been in office than I had spoken to the prior administration entirely," Suarez said at the time. "To me, that's an intentional desire on their part to really plug in with the mayors."
In the months he has been campaigning, however, Suarez – who did not support Trump in 2016 or 2020 – has shied away from criticizing the GOP's front-runner. In June, Suarez hinted he would pardon Trump, saying the tool is useful for presidents to “heal the country.”
。    需要说明的是,这并不是科学记者的夸张之词。天文学家称这些系统为灾难性变星是一个恰当的描述。这个术语描述了一个白矮星和一个次级“正常”恒星的配对,前者是一颗曾经强大的恒星的密集残余物,后者跟太阳类似但质量可能较小。在这对组合的紧密轨道上,白矮星由于其极端的引力而从较大的恒星上吸走恒星物质。

二 | 周三发表在《自然》上的新灾难性变量的发现其特点是一颗大小为太阳1/100的白矮星和一颗更大的恒星--约是太阳质量的10%并挤在一个木星大小的球体中。这对恒星距离地球约3000光年,其被标记为ZTF J1813+4251。它是在兹威基瞬变设施拍摄的图像中被发现,这是一项广域调查,其使用加州帕洛玛天文台的一台望远镜并依次拍摄数百张天空图像。兹威克瞬变设施目录使天文学家能寻找恒星亮度的快速变化。这就是研究人员发现这对奇特的星体的方式。“这是一个特殊的系统,”麻省理工学院的天体物理学家Kevin Burdge说道。他指出,这是已知的行为最优美的灾难性变数之一。Burdge和他的同事们搜索了茨威基的数据以试图在深黑的太空中找到灯塔。

三 | 他们希望看到有规律的眨眼特征--Burdge通常在寻找快速的眨眼,这是因为它们往往是一对恒星快速运行的信号。研究小组看到ZTF J1813+4251每51分钟闪烁一次。据悉,这是其中一颗恒星从另一颗恒星前面经过并使其光线变暗。闪烁的时间跟迄今为止发现的灾难性变星的最短轨道相吻合。

四 | 通过用夏威夷和西班牙的其他望远镜以及天基望远镜进行观测,这使得研究人员对恒星变得更加集中,并能更准确地测量它发出的光线。不过这引发了一个难题。

五 | Burdge在一份新闻稿中指出:“有一颗恒星看起来像太阳,但是太阳无法进入一个短于8小时的轨道。

六 | ”太阳的质量使它无法拥有如此紧密的轨道。那么为什么这颗木星大小的恒星会这样做呢?Burdge和研究小组已经确定的解释是,这颗白矮星一直在吞噬其伙伴星的一大块氢。这留下了一个更密集的氦气核心,而这有助于稳定紧密的轨道。简而言之,研究小组是在这一过程的中间阶段观察这对恒星的,当时白矮星已经剥去了大部分的氢。剥离后的白矮星留下了一个吸积盘,它像土星环一样围绕着核心。“这是一个罕见的案例,我们在从氢到氦的吸积过程中抓住了其中的一个系统,”Burdge说道。

七 | 在12亿颗恒星中,该算法挑出了我们迄今发现的最有趣的灾难性变数之一。这一幸运的发现有助于支持早先提出的关于大灾变体过渡到超短轨道的理论,该理论是在近四十年前提出的--现在我们知道这确实发生了。该小组还进行了模拟以确定ZTF J1813+4251的最终命运。他们预测,在约7000万年后,这对天体将更快地围绕对方运行,每18分钟做一次完整的循环。尽管人们不会看到它,但一旦激光干涉仪空间天线(LISA)在2030年代末的某个时候进入轨道,那么研究人员将能更详细地研究这个灾难性的变量。这一系列卫星将被用来探测引力波--这些恒星舞伴将产生引力波。

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