一。新闻简报。
1。在有报道称美国政府正准备向乌克兰发送远程系统后，拜登总统周一表示，美国不会向乌克兰发送可能到达俄罗斯的火箭系统。
2。据《南华早报》报道，中国核当局在地球以下浅层发现了丰富的铀矿床。这一发现被称为中国国家安全的突破，也可能改变科学界对铀形成的理解，为全球铀探测提供新途径。
3。据巴西民防组织称，由于倾盆大雨引发洪水和山体滑坡，至少有 91 人丧生，巴西东北部伯南布哥州的居民正准备迎接更多天的大雨。民防在推特上说，还有26 人据报失踪。
4。一项为期七年的研究项目结果表明，可能有一种新方法可以治疗成人中最常见和最具破坏性的脑癌之一，多形性胶质母细胞瘤 (GBM)。在 BMC Cancer 上发表的一项同行评议研究中，萨里大学的科学家证明，短链氨基酸（HTL-001 肽）可有效靶向和抑制导致多形性胶质母细胞瘤的基因家族的功能。 该研究是在细胞和动物中进行的。
5。台北，5 月 30 日（路透社）——台湾周一报道了自1 月以来中国空军在其防空区进行的最大规模入侵。台湾国防部表示，在最近紧张局势升级的情况下，台湾战斗警告 了30 架中国飞机撤离。
6。由医学博士 Kai Wucherpfennig 领导的 Wyss 研究所和 Dana-Farber 癌症研究所 (DFCI) 的科学家团队。已经开发出一种新的癌症疫苗，通过诱导身体产生针对“杀死我”蛋白质的抗体来靶向这一过程。 这种方法有效地将它们锁定在癌细胞表面，防止细胞破坏它们。 这反过来又使它们可以触发 T 细胞和 NK 细胞的杀伤反应。
7。周一下午，英国一场地震震动了中部地区的部分地区。斯塔福德郡和什罗普郡的居民报告说感到震颤，有人说他们的房子左右摇晃。英国地质调查局 (BGS) 检测到震级为 3.8 级的地下 8 公里处的地震——这是英国数月来最强的一次。
8。由加州大学圣地亚哥分校医学院的科学家领导的一个国际研究小组报告说，一种抑制靶向神经细胞信号传导的基因疗法有效地减轻了脊髓或周围神经损伤小鼠的神经性疼痛，并且没有可检测到的副作用。
9。菲律宾海岸警卫队负责人周五表示，菲律宾已经安装了浮标并开设了一些指挥所，以标出并维护其在有争议的南中国海声称拥有主权的水域和岛屿的主权。
10。在其下一代星际飞船火箭的首次轨道发射延迟数月之后，SpaceX 希望本周能从美国联邦航空管理局(FAA) 那里获得好消息。即希望美国联邦航空局最终完成其长期的环境审查——称为计划环境评估 (PEA)——这将确定星际飞船的首次轨道试飞是否可以在 SpaceX 位于得克萨斯州博卡奇卡的星际基地发射设施进行 。
11。麻省理工学院的一组研究人员声称，实验室制造的木材可以取代由真木制成的产品。 他们开发了一种技术，可以生产任何形状和大小的木材，例如，如果您需要一把新的木椅，使用研究人员的技术，您可以在实验室中创建它，而无需砍伐一棵树。
12。加拿大飞机制造商庞巴迪（Bombardier）推出了全球 8000 型飞机，这是一款最高运行速度为每小时721 英里的新飞机——使其成为世界上最快的私人飞机。
13。周一，十个太平洋岛国拒绝了中国推动达成一项范围广泛的区域安全协议，担心该提议旨在将它们拉入北京的轨道。中国外交部长王毅与小岛国领导人在斐济的会谈未能达成协议。
14。台湾外交部表示，由伊利诺伊州民主党参议员塔米·达克沃斯率领的美国代表团周一抵达台北，此前未宣布访问。台湾总统发言人张泽维尔说，代表团将于周二会见台湾总统蔡英文，他们将讨论“地区安全、经贸合作以及与美台双边关系有关的所有问题”。
15。中国即将将三名宇航员送入太空，住在中国仍在建设中的天宫空间站。据中国官方媒体 CGTN 报道，此次发射原定于 6 月的某个时间进行，但周日中国已将把宇航员送入太空的火箭安置在戈壁沙漠酒泉卫星发射中心的发射台。
二．美国疫情
昨日美国新增新冠患者4,288人
总确诊人数为83,984,644人。
新增死亡人数7人。
总死亡 1,004,733人。
康州新增新冠感染_人，新增死_人。
纽约州新增新冠确诊人数_人。新增死亡人数_人。
新泽西州昨天新增病例为_人。新增死亡为_人。
马萨诸塞州新增新冠患者为_人, 死亡_人。
马里兰州昨日新增新冠患者_人。新增死亡人数为_人。
三。世界疫情
1） 亚洲疫情：
昨日印度新增新冠患者2,706人；
日本新增20,698人；
印尼新增242人；
菲律宾新增199人；
土耳其新增864人。
台湾昨日新增__.
韩国昨日新增_人,
中国新增3,173人。
2）非洲疫情：
南非昨日新增新冠患者1,774人。
3）拉美疫情：
巴西昨日新增新冠患者8,195人.
哥伦比亚新增0人。
智利新增8,656人。
墨西哥新增_人。
4）欧洲疫情
俄罗斯昨日新增新冠患者4,118人。
德国新增755人。
法国新增16,440人。
英国新增5人。
意大利新增15,136人。
5）全球新冠总感染人数为529,271,185人。
总死亡人数为6,288,760人。
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顾震帝 2022年5月31日。
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‘A whole different mindset’
Accurate clockwork is one matter. But how future astronauts living and working on the lunar surface will experience time is a different question entirely.
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On Earth, our sense of one day is governed by the fact that the planet completes one rotation every 24 hours, giving most locations a consistent cycle of daylight and darkened nights. On the moon, however, the equator receives roughly 14 days of sunlight followed by 14 days of darkness.
“It’s just a very, very different concept” on the moon, Betts said. “And (NASA is) talking about landing astronauts in the very interesting south polar region (of the moon), where you have permanently lit and permanently shadowed areas. So, that’s a whole other set of confusion.”
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“It’ll be challenging” for those astronauts, Betts added. “It’s so different than Earth, and it’s just a whole different mindset.”
That will be true no matter what time is displayed on the astronauts’ watches.
Still, precision timekeeping matters — not just for the sake of scientifically understanding the passage of time on the moon but also for setting up all the infrastructure necessary to carry out missions.
The beauty of creating a time scale from scratch, Gramling said, is that scientists can take everything they have learned about timekeeping on Earth and apply it to a new system on the moon.
And if scientists can get it right on the moon, she added, they can get it right later down the road if NASA fulfills its goal of sending astronauts deeper into the solar system.
“We are very much looking at executing this on the moon, learning what we can learn,” Gramling said, “so that we are prepared to do the same thing on Mars or other future bodies.”
Lunar clockwork
What scientists know for certain is that they need to get precision timekeeping instruments to the moon.
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Exactly who pays for lunar clocks, which type of clocks will go, and where they’ll be positioned are all questions that remain up in the air, Gramling said.
“We have to work all of this out,” she said. “I don’t think we know yet. I think it will be an amalgamation of several different things.”
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Atomic clocks, Gramling noted, are great for long-term stability, and crystal oscillators have an advantage for short-term stability.
“You never trust one clock,” Gramling added. “And you never trust two clocks.”
Clocks of various types could be placed inside satellites that orbit the moon or perhaps at the precise locations on the lunar surface that astronauts will one day visit.
As for price, an atomic clock worthy of space travel could cost around a few million dollars, according Gramling, with crystal oscillators coming in substantially cheaper.
But, Patla said, you get what you pay for.
“The very cheap oscillators may be off by milliseconds or even 10s of milliseconds,” he added. “And that is important because for navigation purposes — we need to have the clocks synchronized to 10s of nanoseconds.”
A network of clocks on the moon could work in concert to inform the new lunar time scale, just as atomic clocks do for UTC on Earth.
(There will not, Gramling added, be different time zones on the moon. “There have been conversations about creating different zones, with the answer: ‘No,’” she said. “But that could change in the future.”)
‘A whole different mindset’
Accurate clockwork is one matter. But how future astronauts living and working on the lunar surface will experience time is a different question entirely.
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On Earth, our sense of one day is governed by the fact that the planet completes one rotation every 24 hours, giving most locations a consistent cycle of daylight and darkened nights. On the moon, however, the equator receives roughly 14 days of sunlight followed by 14 days of darkness.
“It’s just a very, very different concept” on the moon, Betts said. “And (NASA is) talking about landing astronauts in the very interesting south polar region (of the moon), where you have permanently lit and permanently shadowed areas. So, that’s a whole other set of confusion.”
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“It’ll be challenging” for those astronauts, Betts added. “It’s so different than Earth, and it’s just a whole different mindset.”
That will be true no matter what time is displayed on the astronauts’ watches.
Still, precision timekeeping matters — not just for the sake of scientifically understanding the passage of time on the moon but also for setting up all the infrastructure necessary to carry out missions.
The beauty of creating a time scale from scratch, Gramling said, is that scientists can take everything they have learned about timekeeping on Earth and apply it to a new system on the moon.
And if scientists can get it right on the moon, she added, they can get it right later down the road if NASA fulfills its goal of sending astronauts deeper into the solar system.
“We are very much looking at executing this on the moon, learning what we can learn,” Gramling said, “so that we are prepared to do the same thing on Mars or other future bodies.”
Space, time: The continual question
If time moves differently on the peaks of mountains than the shores of the ocean, you can imagine that things get even more bizarre the farther away from Earth you travel.
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To add more complication: Time also passes slower the faster a person or spacecraft is moving, according to Einstein’s theory of special relativity.
Astronauts on the International Space Station, for example, are lucky, said Dr. Bijunath Patla, a theoretical physicist with the US National Institute of Standards and Technology, in a phone interview. Though the space station orbits about 200 miles (322 kilometers) above Earth’s surface, it also travels at high speeds — looping the planet 16 times per day — so the effects of relativity somewhat cancel each other out, Patla said. For that reason, astronauts on the orbiting laboratory can easily use Earth time to stay on schedule.
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For other missions — it’s not so simple.
Fortunately, scientists already have decades of experience contending with the complexities.
Spacecraft, for example, are equipped with their own clocks called oscillators, Gramling said.
“They maintain their own time,” Gramling said. “And most of our operations for spacecraft — even spacecraft that are all the way out at Pluto, or the Kuiper Belt, like New Horizons — (rely on) ground stations that are back on Earth. So everything they’re doing has to correlate with UTC.”
But those spacecraft also rely on their own kept time, Gramling said. Vehicles exploring deep into the solar system, for example, have to know — based on their own time scale — when they are approaching a planet in case the spacecraft needs to use that planetary body for navigational purposes, she added.
For 50 years, scientists have also been able to observe atomic clocks that are tucked aboard GPS satellites, which orbit Earth about 12,550 miles (20,200 kilometers) away — or about one-nineteenth the distance between our planet and the moon.
Studying those clocks has given scientists a great starting point to begin extrapolating further as they set out to establish a new time scale for the moon, Patla said.
“We can easily compare (GPS) clocks to clocks on the ground,” Patla said, adding that scientists have found a way to gently slow GPS clocks down, making them tick more in-line with Earth-bound clocks. “Obviously, it’s not as easy as it sounds, but it’s easier than making a mess.”
‘A whole different mindset’
Accurate clockwork is one matter. But how future astronauts living and working on the lunar surface will experience time is a different question entirely.
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On Earth, our sense of one day is governed by the fact that the planet completes one rotation every 24 hours, giving most locations a consistent cycle of daylight and darkened nights. On the moon, however, the equator receives roughly 14 days of sunlight followed by 14 days of darkness.
“It’s just a very, very different concept” on the moon, Betts said. “And (NASA is) talking about landing astronauts in the very interesting south polar region (of the moon), where you have permanently lit and permanently shadowed areas. So, that’s a whole other set of confusion.”
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“It’ll be challenging” for those astronauts, Betts added. “It’s so different than Earth, and it’s just a whole different mindset.”
That will be true no matter what time is displayed on the astronauts’ watches.
Still, precision timekeeping matters — not just for the sake of scientifically understanding the passage of time on the moon but also for setting up all the infrastructure necessary to carry out missions.
The beauty of creating a time scale from scratch, Gramling said, is that scientists can take everything they have learned about timekeeping on Earth and apply it to a new system on the moon.
And if scientists can get it right on the moon, she added, they can get it right later down the road if NASA fulfills its goal of sending astronauts deeper into the solar system.
“We are very much looking at executing this on the moon, learning what we can learn,” Gramling said, “so that we are prepared to do the same thing on Mars or other future bodies.”
‘A whole different mindset’
Accurate clockwork is one matter. But how future astronauts living and working on the lunar surface will experience time is a different question entirely.
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On Earth, our sense of one day is governed by the fact that the planet completes one rotation every 24 hours, giving most locations a consistent cycle of daylight and darkened nights. On the moon, however, the equator receives roughly 14 days of sunlight followed by 14 days of darkness.
“It’s just a very, very different concept” on the moon, Betts said. “And (NASA is) talking about landing astronauts in the very interesting south polar region (of the moon), where you have permanently lit and permanently shadowed areas. So, that’s a whole other set of confusion.”
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“It’ll be challenging” for those astronauts, Betts added. “It’s so different than Earth, and it’s just a whole different mindset.”
That will be true no matter what time is displayed on the astronauts’ watches.
Still, precision timekeeping matters — not just for the sake of scientifically understanding the passage of time on the moon but also for setting up all the infrastructure necessary to carry out missions.
The beauty of creating a time scale from scratch, Gramling said, is that scientists can take everything they have learned about timekeeping on Earth and apply it to a new system on the moon.
And if scientists can get it right on the moon, she added, they can get it right later down the road if NASA fulfills its goal of sending astronauts deeper into the solar system.
“We are very much looking at executing this on the moon, learning what we can learn,” Gramling said, “so that we are prepared to do the same thing on Mars or other future bodies.”
Lunar clockwork
What scientists know for certain is that they need to get precision timekeeping instruments to the moon.
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Exactly who pays for lunar clocks, which type of clocks will go, and where they’ll be positioned are all questions that remain up in the air, Gramling said.
“We have to work all of this out,” she said. “I don’t think we know yet. I think it will be an amalgamation of several different things.”
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Atomic clocks, Gramling noted, are great for long-term stability, and crystal oscillators have an advantage for short-term stability.
“You never trust one clock,” Gramling added. “And you never trust two clocks.”
Clocks of various types could be placed inside satellites that orbit the moon or perhaps at the precise locations on the lunar surface that astronauts will one day visit.
As for price, an atomic clock worthy of space travel could cost around a few million dollars, according Gramling, with crystal oscillators coming in substantially cheaper.
But, Patla said, you get what you pay for.
“The very cheap oscillators may be off by milliseconds or even 10s of milliseconds,” he added. “And that is important because for navigation purposes — we need to have the clocks synchronized to 10s of nanoseconds.”
A network of clocks on the moon could work in concert to inform the new lunar time scale, just as atomic clocks do for UTC on Earth.
(There will not, Gramling added, be different time zones on the moon. “There have been conversations about creating different zones, with the answer: ‘No,’” she said. “But that could change in the future.”)
‘A whole different mindset’
Accurate clockwork is one matter. But how future astronauts living and working on the lunar surface will experience time is a different question entirely.
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On Earth, our sense of one day is governed by the fact that the planet completes one rotation every 24 hours, giving most locations a consistent cycle of daylight and darkened nights. On the moon, however, the equator receives roughly 14 days of sunlight followed by 14 days of darkness.
“It’s just a very, very different concept” on the moon, Betts said. “And (NASA is) talking about landing astronauts in the very interesting south polar region (of the moon), where you have permanently lit and permanently shadowed areas. So, that’s a whole other set of confusion.”
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“It’ll be challenging” for those astronauts, Betts added. “It’s so different than Earth, and it’s just a whole different mindset.”
That will be true no matter what time is displayed on the astronauts’ watches.
Still, precision timekeeping matters — not just for the sake of scientifically understanding the passage of time on the moon but also for setting up all the infrastructure necessary to carry out missions.
The beauty of creating a time scale from scratch, Gramling said, is that scientists can take everything they have learned about timekeeping on Earth and apply it to a new system on the moon.
And if scientists can get it right on the moon, she added, they can get it right later down the road if NASA fulfills its goal of sending astronauts deeper into the solar system.
“We are very much looking at executing this on the moon, learning what we can learn,” Gramling said, “so that we are prepared to do the same thing on Mars or other future bodies.”