Libro de Visitas

Johnniedub

31 Mar 2025 - 06:38 pm

Curiosity rover makes ‘arguably the most exciting organic detection to date on Mars’
bungee exchange

The NASA Curiosity rover has detected the largest organic molecules found to date on Mars, opening a window into the red planet’s past. The newly detected compounds suggest complex organic chemistry may have occurred in the planet’s past — the kind necessary for the origin of life, according to new research.

The organic compounds, which include decane, undecane and dodecane, came to light after the rover analyzed a pulverized 3.7 billion-year-old rock sample using its onboard mini lab called SAM, short for Sample Analysis at Mars.

Scientists believe the long chains of molecules could be fragments of fatty acids, which are organic molecules that are chemical building blocks of life on Earth and help form cell membranes. But such compounds can also be formed without the presence of life, created when water interacts with minerals in hydrothermal vents.

The molecules cannot currently be confirmed as evidence of past life on the red planet, but they add to the growing list of compounds that robotic explorers have discovered on Mars in recent years. A study detailing the findings was published Monday in the journal Proceedings of the National Academy of Sciences.
The detection of the fragile molecules also encourages astrobiologists that if any biosignatures, or past signs of life, ever existed on Mars, they are likely still detectable despite the harsh solar radiation that has bombarded the planet for tens of millions of years.

“Ancient life, if it happened on Mars, it would have released some complex and fragile molecules,” said lead study author Dr. Caroline Freissinet, research scientist at the French National Centre for Scientific Research in the Laboratory for Atmospheres, Observations, and Space in Guyancourt, France. “And because now we know that Mars can preserve these complex and fragile molecules, it means that we could detect ancient life on Mars.”

Leonardanold

31 Mar 2025 - 06:32 pm

Everyone is talking about Greenland. Here’s what it’s like to visit
cow fi

A few months ago, Greenland was quietly getting on with winter, as the territory slid deeper into the darkness that envelops the world’s northerly reaches at this time of year.

But President Donald Trump’s musings about America taking over this island of 56,000 largely Inuit people, halfway between New York and Moscow, has seen Greenland shaken from its frozen Arctic anonymity.

Denmark, for whom Greenland is an autonomous crown dependency, has protested it’s not for sale. Officials in Greenland, meanwhile, have sought to assert the territory’s right to independence.

The conversation continues to intensify. A contentious March 28 visit to a US military installation by Usha Vance, the second lady, accompanied by her husband, Vice President JD Vance, was the latest in a series of events to focus attention on Trump’s ambitions for Greenland.

The visit was originally planned as a cultural exchange, but was shortened following complaints from Greenland Prime Minister Mute B. Egede.

Had the Vances prolonged their scheduled brief visit, they would’ve discovered a ruggedly pristine wildernesses steeped in rich Indigenous culture.

An inhospitable icecap several miles deep covers 80% of Greenland, forcing the Inuit to dwell along the shorelines in brightly painted communities. Here, they spend brutally cold winters hunting seals on ice under the northern lights in near perpetual darkness. Although these days, they can also rely on community stores.

The problem for travelers over the years has been getting to Greenland via time-consuming indirect flights. That’s changing. Late in 2024, the capital Nuuk opened a long-delayed international airport. From June 2025, United Airlines will be operating a twice-weekly direct service from Newark to Nuuk.

Two further international airports are due to open by 2026 — Qaqortoq in South Greenland and more significantly in Ilulissat, the island’s only real tourism hotspot.

Marvinestax

31 Mar 2025 - 06:28 pm

The world’s largest architectural model captures New York City in the ’90s
aerodrome finance
The Empire State building stands approximately 15 inches tall, whereas the Statue of Liberty measures at just under two inches without its base. At this scale, even ants would be too big to represent people in the streets below.

These lifelike miniatures of iconic landmarks can be found on the Panorama — which, at 9,335 square feet, is the largest model of New York City, meticulously hand-built at a scale of 1:1,200. The sprawling model sits in its own room at the Queens Museum, where it was first installed in the 1960s, softly rotating between day and night lighting as visitors on glass walkways are given a bird’s eye view of all five boroughs of the city.

To mark the model’s 60th anniversary, which was celebrated last year, the museum has published a new book offering a behind-the-scenes look at how the Panorama was made. Original footage of the last major update to the model, completed in 1992, has also gone on show at the museum as part of a 12-minute video that features interviews with some of the renovators.

The Queens Museum’s assistant director of archives and collections, Lynn Maliszewski, who took CNN on a visit of the Panorama in early March, said she hopes the book and video will help to draw more visitors and attention to the copious amount of labor — over 100 full-time workers, from July 1961 to April 1964 — that went into building the model.

“Sometimes when I walk in here, I get goosebumps, because this is so representative of dreams and hopes and family and struggle and despair and excitement… every piece of the spectrum of human emotion is here (in New York) happening at the same time,” said Maliszewski. “It shows us things that you can’t get when you’re on the ground.”
Original purpose
The Panorama was originally built for the 1964 New York World’s Fair, then the largest international exhibition in the US, aimed at spotlighting the city’s innovation. The fair was overseen by Robert Moses, the influential and notorious urban planner whose highway projects displaced hundreds of thousands New Yorkers. When Moses commissioned the Panorama, which had parts that could be removed and redesigned to determine new traffic patterns and neighborhood designs, he saw an opportunity to use it as a city planning tool.

Originally built and revised with a margin of error under 1%, the model was updated multiple times before the 1990s, though it is now frozen in time. According to Maliszewski, it cost over $672,000 to make in 1964 ($6.8 million in today’s money) and nearly $2 million (about $4.5 million today) was spent when it was last revised in 1992.

Kellyvidge

31 Mar 2025 - 06:05 pm

The fish collectors hoping to save rare species from extinction
phantom wallet
In the rural town of Petersham, Massachusetts, 78-year-old Peter George keeps 1,000 fish in his basement.

“Baseball, sex, fish,” he says, listing his life’s great loves. “My single greatest attribute is that I am passionate about things. That sort of defines me.”

All of George’s fish are endangered Rift Lake cichlids: colorful, freshwater fish native to the Great Lakes of East Africa. Inside his 42 tanks, expertly squeezed into a single subterranean room, the fish shimmer under artificial lights, knowing nothing of the expansive waters in which their ancestors once swam, thousands of miles away.

Due to pollution, climate change and overfishing, freshwater fish are thought to be the second most endangered vertebrates in the world. In Lake Victoria, a giant lake shared between Kenya, Uganda and Tanzania, over a quarter of endemic species, including countless cichlids, are either critically endangered or extinct.

But for some species, there is still hope. A community of rare fish enthusiasts collect endangered species of freshwater fish from the lakes and springs of East Africa, Mexico and elsewhere, and preserve them in their personal fish tanks in the hope that they might one day be reintroduced in the wild.

“I’m a hard ass,” George says. “There is hope.”
Insurance
George has been collecting fish since 1948 when, as a four-year-old in the Bronx, he would look after his grandmother’s rainbow fish. He soon developed “multiple tank syndrome” – a colloquial term used by fish collectors to denote the spiral commonly experienced after acquiring one’s first tank, which involves the sufferer buying many more tanks within a short space of time. He has not stopped collecting since.

Now, George sees himself as a conservationist; his tanks contain what is known as “insurance populations” – populations of endangered fish that are likely to go extinct in their natural habitats. He believes that when the time is right, they can be taken from his collection and returned to their homes. “I would never accept the fact that they couldn’t be reintroduced,” he says.

Sbjames

31 Mar 2025 - 05:24 pm

Якщо ще не знаєте, куди вирушити в квітні, ось вам список весняних напрямків — я обрав Кіпр!

Felixhof

31 Mar 2025 - 04:11 pm

Что дает промокод от Пари (Парибет)
Промокод «Пари» активирует бонусное предложение букмекера. Например, по эксклюзивному коду можно получить до 25 000 рублей на 1-й депозит. Для этого необходимо:

при регистрации указать промокод;

подтвердить личность;

пополнить счёт минимум на 100 рублей в течение 2 недель с момента регистрации;

В течение 3 дней на бонусный счёт прилетит 100% от суммы депозита.

Пари Промокод 2025 — 100% Бонус на Депозит до 25000 руб:

https://radiolamps.ru/articles/pages/promokod_pari_pri_registracii_2025__bonus_na_fribet_.html

Как активировать промокод в БК PARI
Новые клиенты букмекерской компании Pari могут получить бонус до 20 000 рублей. Для этого:

Зайдите на сайт или в приложение букмекерской компании Pari.
При регистрации укажите промокод.
Подтвердите учётную запись.
Внесите депозит от 100 рублей.
После выполнения условий акции бонус в размере 100% от депозита поступит на счёт в течение трёх дней.

Условия получения бонусного промокода
Общее условие очень простое: достаточно знать актуальный промокод и ввести его в специальное поле в форме на сайте букмекера — либо при регистрации, либо в личном кабинете.

Но имейте в виду, что у «Пари» бонусных промокодов нет. Акции, бонусы, конкурсы — всё это действует не по кодам, а для всех клиентов букмекера, которые имеют право участвовать.

Перед активацией бонуса рекомендуем внимательно прочитать условия предложения. В них подробно расписывается, какие действия требуется выполнить для получения награды и её отыгрыша.

Kevinveple

31 Mar 2025 - 03:23 pm

A long time in the making
Curiosity landed in Gale Crater on August 6, 2012. More than 12 years later, the rover has driven over 21 miles (34 kilometers) to ascend Mount Sharp, which is within the crater. The feature’s many layers preserve millions of years of geological history on Mars, showing how it shifted from a wet to a dry environment.
celer bridge
Perhaps one of the most valuable samples Curiosity has gathered on its mission to understand whether Mars was ever habitable was collected in May 2013.

The rover drilled the Cumberland sample from an area within a crater called Yellowknife Bay, which resembled an ancient lake bed. The rocks from Yellowknife Bay so intrigued Curiosity’s science team that it had the rover drive in the opposite direction to collect samples from the area before heading to Mount Sharp.
Since collecting the Cumberland sample, Curiosity has used SAM to study it in a variety of ways, revealing that Yellowknife Bay was once the site of an ancient lake where clay minerals formed in water. The mudstone created an environment that could concentrate and preserve organic molecules and trapped them inside the fine grains of the sedimentary rock.

Freissinet helped lead a research team in 2015 that was able to identify organic molecules within the Cumberland sample.

The instrument detected an abundance of sulfur, which can be used to preserve organic molecules; nitrates, which are essential for plant and animal health on Earth; and methane composed of a type of carbon associated with biological processes on Earth.

“There is evidence that liquid water existed in Gale Crater for millions of years and probably much longer, which means there was enough time for life-forming chemistry to happen in these crater-lake environments on Mars,” said study coauthor Daniel Glavin, senior scientist for sample return at NASA’s Goddard Space Flight Center in Greenbelt, Maryland, in a statement.

Jamesraf

31 Mar 2025 - 03:20 pm

‘For the public to enjoy’
keplr wallet
The museum’s history starts in 1998, when Sheikh Faisal Bin Qassim Al Thani opened a building to the public on his farm some 20 kilometers (12 miles) north of Qatari capital Doha.

A distant relative of Qatar’s ruling family, founder and chairman of Al Faisal Holdings (one of Qatar’s biggest conglomerates), and a billionaire whose business acumen had him recognized as one of the most influential Arab businessmen in the world, Sheikh Faisal had already amassed a substantial private collection of historically important regional artifacts, plus a few quirky pieces of interest, allowing visitors an intimate look into Qatari life and history.

In an interview with Qatari channel Alrayyan TV in 2018, Sheikh Faisal said that the museum started as a hobby.

“I used to collect items whenever I got the chance,” he said. “As my business grew, so did my collections, and soon I was able to collect more and more items until I decided to put them in the museum for the public to enjoy.”

His private cabinet of curiosities has since evolved into a 130-acre complex. Through the fort-like entrance gate lies an oryx reserve, an impressive riding school and stables, a duck pond and a mosque built with a quirky leaning minaret. There’s now even a five-star Marriott hotel, two cafes and the Zoufa restaurant serving modern Lebanese cuisine.

Of course, there’s also the super-sized museum, with a recently-opened car collection housing everything from vintage Rolls-Royces to wartime Jeeps and colorful Buicks. Outside you’ll find peacocks roaming the grounds, and signs warning drivers to be aware of horses and ostriches.

Visitors to the FBQ museum are free to explore the grounds and can even enter the stables to pat the horses.

Anthonyces

31 Mar 2025 - 02:14 pm

Кракен Darknet – это innovative platform, где анонимность и защита данных become integral part вашего цифрового присутствия. Название "Kraken" is linked с разнообразием ресурсов и innovative solutions. Эта network обеспечивает entry into the realm digital freedom, где rules regular internet не действуют.
kraken market

Rodneybub

31 Mar 2025 - 12:58 pm

Kotty змогла перетворити Trance Illusion на щось більше, ніж просто фестиваль. Її шоу було настільки емоційним, що дехто з глядачів навіть плакав. Особливо мене вразив момент, коли сцена заповнилася яскравими кольоровими хвилями, які синхронізувалися з музикою. Це було справжнє мистецтво.