当前位置:主页 > 三沙 >

伤痕我心

马斯克证实:SpaceX 将在星舰稳定运营后逐步退役猎鹰 9 火箭_我的网站

4公司声讨战狼2

一 |      8 月 25 日消息,传闻如今得到了证实。    

GOP front-runner and four times-indicted Donald Trump will not be physically present at Wednesday evening's first 2024 presidential primary debate. But he'll be there anyway as the troubled candidate remains the dominant figure – and issue – of the nominating contest.
Typically, early debates are a chance for poll-laggers to make an impression, either by delivering a well-placed zinger at a top-tier candidate or shining with a smart response to a question. The front-runners tend to have targets on their backs, which could result in a weakened position or a stronger one, if they handle attacks from primary rivals well.
But in the case of the debate in Milwaukee on Wednesday, the participants are in an awkward, perhaps no-win situation: The front-runner won't even be there, and the rest of the field can't attack him without alienating the very voters they'd need to sew up the nomination, should the legally imperiled Trump be forced to suspend his campaign.
Trump is "going to be the huge, spray-tanned elephant in the room. He's going to be what everybody is thinking about, even though he's not there," says Dave Cohen, a political science professor at the University of Akron.
That means the eight candidates who have qualified for the debate – Florida Gov. Ron DeSantis, tech entrepreneur Vivek Ramaswamy, Sen. Tim Scott of South Carolina, former U.N. Ambassador Nikki Haley, former Vice President Mike Pence, North Dakota Gov. Doug Burgum, former New Jersey Gov. Chris Christie and former Arkansas Gov. Asa Hutchinson – have few choices, and none is terribly appealing.
They can attack Trump, defend him or try to ignore him – which debate moderators are not likely to let pass, Cohen says. None of those approaches helps a candidate emerge as a better choice than Trump without angering Trump's rank-and-file loyalists.
"They're in a difficult spot, strategically," says Stephen Smith, professor at the School of Politics and Global Studies at Arizona State University. But "it's one they've earned," he adds.
Only a few have been willing to criticize Trump directly, and it's not appeared to have endeared them to GOP primary voters.
Christie – who worked on Trump's transition team before turning on him – has been the most aggressive in his attacks on Trump, saying the former president lacks the "character" to serve in the Oval Office and needling Trump for skipping the debate, which Christie last week called "completely disrespectful" to GOP voters.
The tactic – essentially making himself the marquee foil of Trump – is based on the gamble that if Trump ends up leaving the race, Christie will emerge as the most prominent truth-teller and default new front-runner.
It's not going so well, so far: National polls have Christie in the low single digits. A recent Des Moines Register/NBC poll in Iowa puts Christie in sixth place with 5% support among GOP caucus-goers.
Former Arkansas Gov. Asa Hutchinson – who arguably on paper has the most complete and traditional resume for a Republican presidential contender – is also polling in the low single digits, his criticism of Trump not moving the needle at all.
Former Vice President Mike Pence has stepped up his criticism of Trump's behavior – saying the former president asked him to put him above the Constitution by asking him to refuse to certify the 2020 election results – but hasn't made it as personal.
Pence recently said he was not aware of any "broad-based effort" to declassify records before Trump left office, undercutting the former president's claim that the classified documents he is accused of taking and improperly keeping at his Mar-a-Lago resort were, in fact, declassified. But Pence has also been reluctant to say Trump should be treated like any other politician who has been convicted of a felony – meaning, ousted from office.
"I think that needs to be left to the American people. Look, let’s let the former president have his day in court. Let’s maintain a presumption of innocence in this matter," Pence told ABC on Sunday.
Former U.S. Ambassador Nikki Haley – the only woman who will be onstage Wednesday night – has cautioned that Trump's legal troubles could cost Republicans the general election. She hasn't directly criticized the former president but didn't shy away earlier this month by reminding people of how much worse Trump's situation is getting.
"Like most Americans, I’m tired of commenting on every Trump drama. I’ve lost track of whether this indictment is the third or fourth or the fifth," Haley said during an appearance on “Good Morning New Hampshire” radio show with Jack Heath – before the fourth indictment out of Georgia’s Fulton County.
Others have responded to questions about Trump with attacks on the criminal justice system and its prosecutors themselves.
Florida Gov. Ron DeSantis, who is running a distant second to Trump in most polls, decried the "weaponization of government" after Trump's third indictment – though he conceded he had not actually read the document. DeSantis also acknowledged recently that the 2020 election was not stolen, telling NBC "of course he lost" when asked about Trump's discredited claims of a fraudulent 2020 contest – a comment not likely to endear him to Trump's most devoted supporters.
Sen. Tim Scott of South Carolina called the recent indictment of Trump "un-American and unacceptable. We need a better system than that."
Tech entrepreneur Vivek Ramaswamy, who has edged upward in a couple of state polls, has walked a similar line.
"These are politicized persecutions through prosecution,” he said at a town hall meeting last week. “It would be a lot easier for me if Donald Trump were not in this primary, but that is not how I want to win this election," he added.
And North Dakota Gov. Doug Burgum is just deflecting the matter entirely.
"I do trust the voters. ... They want presidential elections to be about the future, a vision for the future," Burgum told NBC's "Meet the Press" on Sunday after being asked about Trump's troubles.
In reality, it is the candidates not named Trump who will have the most to prove or explain Wednesday night, analysts say. DeSantis, whose campaign has been flailing, might need to explain why he suggested some Republicans backing Trump are "listless vessels" – a cringe-worthy similar remark to 2016 Democratic presidential nominee Hillary Clinton reference to the "basket of deplorables" in Trump's base.
As the front-runner among the also-rans, DeSantis will likely take the heaviest rhetorical artillery from the GOP field at the debate. Most of the rest will be struggling to get out of single digits – with the possible exception of Burgum, who is still trying to get the American public to recognize his name.
Trump, meanwhile, said he plans to counter-program with the airing of a taped one-on-one interview with former Fox News host Tucker Carlson. Thursday – a day when the political news would typically be dominated by post-debate analysis – Trump will be the star player in an unprecedented legal and political drama, turning himself in for processing at a Fulton County jail.
"He's cutting right into the shadow of the debate" with that timing, Smith says. As he undoubtedly will during the debate itself.
。SpaceX 计划在其巨型下一代火箭“星舰”(Starship)开始定期执行运营任务后,逐步退役目前公司的主力火箭“猎鹰 9”(Falcon 9)。

二 | SpaceX 于 2010 年首次发射猎鹰 9,此后这款火箭很快在航天史上留下了浓墨重彩的一笔。迄今为止,猎鹰 9 已经发射近 700 次,并成为人类历史上首款能够让轨道级火箭一级助推器着陆并重复使用的火箭。

三 | 自 1957 年开始服役的俄罗斯联盟号火箭,是目前执行任务次数唯一超过猎鹰 9 的运载火箭,不过猎鹰 9 有望在明年超过它。然而,SpaceX 创始人兼 CEO 埃隆 · 马斯克 8 月 22 日在 X 上表示,逐步结束“猎鹰”系列火箭的生产和使用是不可避免的。这不仅包括猎鹰 9,还包括采用三级助推器设计的猎鹰重型火箭,后者迄今已经执行过 12 次发射任务。马斯克表示:“一旦星舰能够实现每周数次的稳定飞行,将 SpaceX 极为稀缺的工程和生产资源转移至星舰以将发射频率提升至每日数次便具有合理性,这意味着猎鹰系列的逐步停产。”猎鹰 9 退出商业发射市场后会产生多大影响,目前还很难判断。不过,行业报告显示,SpaceX 可能从 2028 年开始取消绝大多数猎鹰 9 发射任务,只保留少量任务。

四 | 这些任务很可能包括为 NASA 执行国际空间站(ISS)的载人和补给任务。国际空间站预计至少运行至 2030 年,这意味着商业客户届时可能不得不开始依赖星舰将卫星送入太空。SpaceX 何时开始逐步退出猎鹰 9,将取决于星舰后续的研发进展。与上一代火箭不同,星舰从一开始就按照完全可重复使用的目标设计,其“超级重型”(Super Heavy)助推器和“星舰”上面级都能够返回地球并回收后再次执行飞行任务。而猎鹰 9 和猎鹰重型的上面级则属于一次性使用部件。星舰的体型也远大于猎鹰 9。

五 | 目前的第三代(V3)星舰高达 408 英尺,也就是 124.4 米,而猎鹰 9 的高度为 230 英尺,即 70 米。星舰能够将重量大得多的有效载荷送入太空,预计可以向近地轨道(LEO)运送超过 100 吨载荷。相比之下,猎鹰 9 和猎鹰重型向近地轨道运送的载荷能力分别约为 25 吨和 63 吨。过去几年,猎鹰 9 的绝大多数发射任务都用于部署 SpaceX 的 Starlink 卫星互联网系统。自 2023 年以来,猎鹰 9 已执行超过 300 次 Starlink 发射任务,帮助不断扩大的星座规模达到 1.1 万多颗卫星。

六 | 不过,新一代 Starlink 卫星的体积更大,设计目标是装入星舰的有效载荷舱,而不是安装在猎鹰 9 顶部。一旦星舰能够稳定执行发射任务,甚至在此之前,SpaceX 就计划开始利用新版本卫星升级 Starlink 网络。这很可能会推动星舰发射次数呈指数级增长。猎鹰 9 当年就经历过类似的发展过程。2019 年,也就是 SpaceX 开始组建 Starlink 星座的那一年,猎鹰 9 仅发射了 11 次。到了 2025 年,猎鹰 9 的发射次数已经达到惊人的 165 次,其中 122 次用于部署 Starlink 卫星。注意到,NASA 也已经与 SpaceX 签订合同,让后者为 Artemis 计划研发用于登月的星舰版本。第三代星舰计划在明年执行 Artemis III 任务,并与 NASA 的“猎户座”飞船在近地轨道进行对接操作演练。

七 | 按照计划,星舰还将在 2028 年执行 Artemis IV 任务,将宇航员送上月球表面。据 Ars Technica 报道,SpaceX 已经告知 NASA,计划在同一年结束商业猎鹰 9 发射任务。不过,目前星舰还没有获得用于与国际空间站对接的合同,也没有针对这一用途进行专门设计。NASA 目前计划继续采购 SpaceX 的货运飞船和载人龙飞船任务,至少到 2030 年前持续向国际空间站运送宇航员和物资,因此很难在短期内将这些任务全部转交给星舰。

八 | 除了成本和合同方面的因素之外,星舰本身巨大的体型也会带来相当大的工程风险,可能超出国际空间站现有的安全设计范围。无论国际空间站最终运行到什么时候,SpaceX 能否按计划让猎鹰 9 逐步退出舞台,最终还是取决于星舰能否取得成功。截至目前,星舰已经完成 13 次亚轨道测试飞行。

九 | 下一次飞行预计将在未来一个月内进行,并有可能首次尝试完整进入轨道。但这只是星舰在真正实现马斯克所说的“每周可靠地飞行数次”之前必须完成的众多里程碑之一。猎鹰 9 已经实现了这样的高频发射能力,但星舰基础设施的建设规模要远远超过目前这十几次成功试飞本身。最终,SpaceX 能多快让星舰达到猎鹰 9 的可靠性和发射频率,将决定这款服役多年的老牌火箭何时能够大规模退出历史舞台。

Current article:http://x2f.shuazhepenxingshuaisenqienai.buzz/news/20260826_35615.html

Published on:17:29:02


Copyright @ 2016-2017 我的网站 版权所有