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A | 北京时间1月15日，SpaceX宣布计划裁员约10%。    Washington, Oct 12 (UNI) American space agency NASA says its recent attempt to deflect the path of an asteroid was successful, after its Dart probe struck an asteroid head-on.
Scientists have now confirmed the orbit of a 160m-wide space rock known as Dimorphos was altered when the Dart probe struck it head on last month.
Researchers came to the conclusion after making measurements using a range of space and Earth-based telescopes.
The mission was conceived to test a potential strategy to defend the Earth against threatening objects.
Dart's achievement proves such an idea would work, provided it was initiated early enough and the target wasn't overly massive.
"This mission shows that Nasa is trying to be ready for whatever the Universe throws at us," said agency administrator Bill Nelson.
"I believe that Nasa has proven that we are serious as a defender of the planet," he told reporters.
The space agency released a raft of data on Tuesday to support its assessment, including new pictures from the Hubble Space Telescope and from a small Italian spacecraft that stood off from the impact by about 50km (30 miles).
The Double Asteroid Redirection Test (Dart) took place some 11 million km (7 million miles) from Earth.
It saw the refrigerator-sized Nasa satellite drive straight into Dimorphos at 22,000km/h (14,000mph), destroying itself in the process.
The space rock orbits a much larger (780m wide; 2,550ft) object called Didymos. Before impact, the time taken for Dimorphos to make one circuit of its sibling was 11 hours and 55 minutes.
The telescope evidence now indicates this orbital period has been reduced to 11 hours and 23 minutes - a change of 32 minutes. This corresponds to Dimorphos moving closer into to Didymos by "tens of metres".
Nasa had defined a minimum successful period change of Dimorphos of 73 seconds or more. The results released on Tuesday show Dart surpassed this benchmark by more than 25 times.
"This is a 4 percent change in the orbital period of Dimorphos around Didymos. Dart just gave it a small nudge. But if you wanted to do this in the future, you'd want to do it years in advance," commented Nancy Chabot from the Johns Hopkins University Applied Physics Laboratory, which led the mission for Nasa.
"Warning time is really key here in order to enable this sort of asteroid deflection to be used in the future as part of a much larger planetary defence strategy."
Nasa's Dart programme scientist, Tom Statler, also had a word of caution about drawing too many conclusions from the experiment.
Asteroids came in many different guises, he said. Their compositions and constructions were diverse - something that was being emphasised every time a mission visited a new object.
"We should not be too eager to say one test on one asteroid tells us exactly how every other asteroid would behave in a similar situation," he stressed.
"But what we can do is use this test as an anchor point for our physics calculations in our simulations that tell us how different kinds of impacts in different situations should behave."
Four years from now, the European Space Agency (Esa) will have three spacecraft - collectively known as the Hera mission - at Didymos and Dimorphos to make follow-up studies.
UNI ING。据知情人士透露，SpaceX首席执行官、总裁兼首席运营官格温·肖特威尔（Gwynne Shotwell）上周五在加州霍桑总部召开了一次员工会议，对裁员的坏消息深表同情。马斯克和肖特维尔在会议上承认，SpaceX的大规模重组意味着该公司不得不解雇一些员工，而他们不想看到这些员工。据两名被解雇的员工称，重组后，SpaceX仍有约6400名员工。上周五，SpaceX要求员工回家查看收件箱，看看是否收到解雇通知。公司将在周末关闭。spacex并不要求每个人都参加员工会议，因此有些人首先通过spacex发送的公司电子邮件了解裁员情况。

B | 从上周五晚上开始，SpaceX使用电子邮件发送员工辞职协议，以及简历撰写、求职协助和其他员工解雇补偿。两名被解雇的员工说，这轮裁员似乎覆盖了整个公司，没有任何一个团队或地区受到不相称的影响或解雇。spacex证实，这轮裁员涵盖了所有团队，公司仍雇佣了6000多名员工。

C | 根据1月11日提交给加利福尼亚州的SpaceX警告，仅在霍桑总部就裁员577人。

D | 在霍桑，SpaceX专注于为大型火箭开发可重复使用的猛禽发动机。

E | SpaceX还裁减了其他公司办公室的员工。”为了继续为我们的客户服务，成功开发星际飞船，建立一个基于太空的全球互联网服务，SpaceX必须成为一个更精简的公司。即使单独尝试这两项任务中的一项，也会导致其他公司破产。

F | 这意味着我们必须向团队中一些才华横溢、勤奋工作的成员道别，并感谢他们为太空探索任务所做的一切努力和贡献。这仅仅是因为公司在未来面临着极其困难的挑战，并且否认没有必要这样做，”spacex上周在一份声明中说。一些SpaceX内部人士对裁员感到惊讶，但其他人说他们已经预料到裁员。肖特维尔在2018年5月的一次采访中表示，尽管经历了多年的财务困境，SpaceX还是盈利了。

G | 她当时表示，SpaceX正在“一点一点地融资”，对那些必须同意该公司长期愿景的投资者有选择性。这一轮裁员的负面影响部分被SpaceX的“龙”飞船成功返回地球所抵消。美国国家航空航天局说，上周末，“龙”号宇宙飞船完成了国际空间站补给任务，并安全返回地球，为科学家们带来了研究和数据。这次任务的完成标志着“龙”号宇宙飞船的“首次夜间着陆和恢复”。换言之，在SpaceX的大规模重组中，该公司能够在夜间在海上回收可重复使用的航天器。

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Published on:17:35:48