Guestbook

Jeffreylom

13 Apr 2025 - 12:57 am

Lunar clockwork
What scientists know for certain is that they need to get precision timekeeping instruments to the moon.
kraken вход
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.”
https://kra30c.cc
kraken вход
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.”)

Virgilget

13 Apr 2025 - 12:56 am

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.
kraken darknet
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.
https://kra30c.cc
kraken ссылка
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.”

Lavillval

12 Apr 2025 - 10:31 pm

methyl r 2, 2 dimethyl 1, 3 dioxolane 4 carboxylate - купить онлайн в интернет-магазине химмед
Tegs: podoplanin antibody 8.1.1 janelia fluor 646 - купить онлайн в интернет-магазине химмед
podoplanin antibody 8.1.1 pe - купить онлайн в интернет-магазине химмед
podoplanin antibody 8.1.1 percp - купить онлайн в интернет-магазине химмед

methyl r 3 bromo 2 methylpropionate - купить онлайн в интернет-магазине химмед https://chimmed.ru/products/methyl-r--3-bromo-2-methylpropionate-id=6468082

Nnetteyha

12 Apr 2025 - 09:14 pm

https://tripscanwin.top/ -
tripscan зеркало


трипскан

https://tripscanwin.top/

Gregoriobl

12 Apr 2025 - 05:04 pm

Не маєш планів на вечір? Просто включи DJ Gafur Techno Radio, і ти знайдеш себе в ритмі.

Nnetteyha

12 Apr 2025 - 03:37 pm

https://tripscanwin.top/ -
tripscan зеркало


tripscan.top войти в личный кабинет

https://tripscanwin.top/

Patrickslumb

12 Apr 2025 - 11:19 am

Аренда яхты в Москве
Аренда яхты в Москве – это доступный и увлекательный способ провести время на воде, наслаждаясь живописными пейзажами столицы и ее окрестностей. Яхты предлагают уникальные возможности для отдыха, мероприятий и романтических прогулок. С каждым годом все больше людей выбирают аренду яхт, чтобы создать незабываемые воспоминания, будь то празднование дня рождения, свадьбы или просто отдых с друзьями.
аренда яхт в Подмосковье
Снять яхту в Москве
Чтобы снять яхту в Москве, вам достаточно учитывать несколько ключевых моментов. Во-первых, важно определить тип яхты, который вам нужен. Существуют моторные, парусные и экскурсионные яхты, каждая из которых обладает своими особенностями и преимуществами. Для небольших компаний подойдут уютные моторные яхты, а для больших мероприятий – просторные парусные или катамараны с несколькими палубами.

Преимущества аренды яхты:
Комфортабельность: Современные яхты оборудованы всем необходимым для комфортного времяпрепровождения: уютные каюты, кухня, отдельные санитарные узлы и зоны для отдыха.
Эстетика: Прогулки на яхте позволяют насладиться великолепными видами на Московское море, парк Коломенское и другие живописные уголки.
Гибкость в организации: Вы можете выбрать маршрут, чтобы посетить понравившиеся места или устроить остановки для купания и отдыха.
Аренда яхт в Подмосковье
Аренда яхт в Подмосковье – это отличное решение для тех, кто хочет провести время вдали от городской суеты. Многие водоемы в этом регионе идеально подходят для яхтенных прогулок. Исследуя Подмосковье, вы можете насладиться красивыми природными пейзажами, увидеть исторические места и просто расслабиться на природе.

Почему стоит арендовать яхту в Подмосковье:
Разнообразие маршрутов: В Подмосковье множество рек и водоемов, таких как река Москва, Волга, Ока и многие другие, которые открывают перед вами широкий выбор маршрутов.
Спокойствие и уединение: Вы можете отдохнуть в тишине природы, насладиться атмосферой удаленности и уединения, что так приятно после напряженных будней.
Организация мероприятий: Аренда яхты может быть идеальным вариантом для проведения корпоративов, дни рождения, праздничных мероприятий или просто для романтического ужина на воде.

Rickyron

12 Apr 2025 - 06:49 am

?Hola! En nuestro sitio web nos esforzamos por ofrecerte agradables experiencias de
contacto con las mejores escort de Valencia, ubicadas cerca de esta magnifica ciudad. Las
escort de Valencia ofrecen los servicios sensuales mas deseados, incluyendo diversos
tipos de masajes y los momentos mas emocionantes, proporcionados por estas fantasticas
escort que residen en Valencia.
Mas detalles aqui: https://valenciascorts.com

Naldgetag

12 Apr 2025 - 04:21 am

https://trip19.top/ -
трипскан вход


tripscan15 cc

https://trip19.top/

Efrencon

11 Apr 2025 - 09:50 pm

Americans nearing retirement and recent retirees said they were anxious and frustrated following a second day of market turmoil that hit their 401(k)s after President Donald Trump’s escalation of tariffs.

kra27
As the impending tariffs shook the global economy Friday, people who were planning on their retirement accounts to carry them through their golden years said the economic chaos was hitting too close to home.

kra9
Some said they are pausing big-ticket purchases and reconsidering home renovations, while others said they fear their quality of life will be adversely affected by all the turmoil.

“I’m just kind of stunned, and with so much money in the market, we just sort of have to hope we have enough time to recover,” said Paula, 68, a former occupational health professional in New Jersey who retired three years ago.

Paula, who spoke on the condition of anonymity because she feared retaliation for speaking out against Trump administration policies, said she was worried about what lies ahead.
https://kr13at.com
“What we’ve been doing is trying to enjoy the time that we have, but you want to be able to make it last,” Paula said Friday. “I have no confidence here.”

Trump fulfilled his campaign promise this week to unleash sweeping tariffs, including on the United States’ largest trading partners, in a move that has sparked fears of a global trade war. The decision sent the stock market spinning. On Friday afternoon, the broad-based S&P 500 closed down 6%, the tech-heavy Nasdaq dropped 5.8%, and the Dow Jones Industrial Average fell more than 2,200 points, or about 5.5%.