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General: JAMESTOWN CALIFORNIA EEUU BACK TO THE FUTURE III HOLY GRAIL VALENCIA SPAIN
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De: BARILOCHENSE6999  (Missatge original) Enviat: 16/01/2024 18:59



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July 25: Arch of Constantine | FCIT
Happy Feast Day of Saint James! | Catholic Celebration
St. James

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Resposta  Missatge 15 de 21 del tema 
De: BARILOCHENSE6999 Enviat: 11/06/2024 14:21

The James Webb telescope: part alien life detector, part time machine

 

In the lead-up to the launch of the James Webb telescope, we look at the scientific objectives of the most powerful space observatory ever sent into orbit.

Are we alone in the universe? What did the first galaxies formed after the Big Bang look like? How did the planets in our solar system emerge? The James Webb telescope hopes to find answers to these existential questions.

Set to launch on December 22, the James Webb is the product of the combined scientific prowess of NASA, the European Space Agency (ESA) and the Canadian Space Agency (CSA) – and by extension, Université de Montréal (UdeM). The CSA contributed a scientific instrument and a guidance sensor to the massive observatory and René Doyon, Director of UdeM’s Institute for Research on Exoplanets (iREx) and a professor in the Physics Department, is the principal investigator on the Canadian scientific team.

Together, the components supplied by the CSA, NASA and the ESA form the most complex, accurate and powerful space observatory ever built, one that promises revolutionary discoveries in astronomy.

The unparalleled power of the observatory will help scientists throughout the world scrutinize the distant reaches of the universe to learn more about the composition and inhabitability of exoplanets and study the life cycle of stars.

Exploring new worlds in search of life

The James Webb Telescope is the successor to the Hubble space telescope but is more precise and efficient because of the size of its mirror, the range of light it can detect and its location.

These attributes will enable the Webb to study the planets in our solar system and other planetary systems in unprecedented detail. Moreover, the scientific instrument developed by Doyon’s team is designed to analyze many types of celestial bodies, including the atmospheric composition of distant exoplanets.

“What we’re looking for, our holy grail, are ‘biosignatures,’ that is, signs of extraterrestrial life,” explained iREx coordinator Nathalie Ouellette, an astrophysicist who does communications for the James Webb.

She hastened to add that we shouldn’t imagine these signs of life the way they are depicted in science fiction films: “We’re talking about finding signs of biological activity or the signature of certain molecules that we have identified as essential to life, such as oxygen, water vapour, carbon dioxide, methane and ozone. Based on the presence of such molecules, particularly in certain combinations, we may be able to determine that conditions are conducive to the development of life when we explore an exoplanet using the telescope.”

Casting light on the dawn of the universe

Telescopes are also time machines of a sort. “Looking into space is like looking into the past,” said Ouellette. “Light waves travel so fast that, to the naked eye, they seem to flash instantly from one point to another. In space, however, the distances are so vast that the time it takes light to travel is perceptible.”

That makes the Webb a marvellous time machine. It will be able to see back in time to 200 million years after the Big Bang, something that has never been done before. “With the Hubble, we could go to 500 million years after the Big Bang, so now we’re going 300 million years further,” noted Ouellette. “That’s remarkable, considering that the beginning of the universe was a tumultuous period. Galaxies were colliding and stars were forming at a rapid pace.”

“Tell me where you come from and I’ll tell you who you are”

The Webb will thus improve our understanding of the development of the first luminous objects (galaxies) over time. Ouellette believes the telescope will also provide insight into the creation of our own solar system.

“We still have many questions about the origins of life in our solar system. We don’t know exactly how we came to be on Earth and how the planets were formed,” Ouellette pointed out. “By studying other systems, stars and planets at various stages of development, we hope to be able to trace our own history and understand ourselves better.”

That is the ultimate goal of the James Webb: to revolutionize our understanding of the universe and, above all, to place the Earth, in all its fragility and uniqueness, in a broader context.

https://nouvelles.umontreal.ca/en/article/2021/12/09/the-james-webb-telescope-part-alien-life-detector-part-time-machine/

Resposta  Missatge 16 de 21 del tema 
De: BARILOCHENSE6999 Enviat: 11/06/2024 16:01
NIRISS, Canada's cosmic time machine on the James Webb Space Telescope -  Infographic - Canadian Space Agency

Resposta  Missatge 17 de 21 del tema 
De: BARILOCHENSE6999 Enviat: 21/06/2024 10:36
emmanuel on Twitter: "McFly has to reach the speed of 88MPH at exactly  10:04 pm or 22:04 military time. In gematria we remove the zero to get the  number 224. Marty crashed
 
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THE JAMES WEBB TELESCOPE: PART ALIEN LIFE DETECTOR, PART TIME MACHINE GRAIL
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De: BARILOCHENSE6999 Enviat: 25/11/2024 20:35
Time Travel between Science Fiction and Biblical Scripture - YouTube

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De: BARILOCHENSE6999 Enviat: 15/12/2024 06:04
James Watt: Father of the Industrial Revolution - Engineer's Planet

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De: BARILOCHENSE6999 Enviat: 15/12/2024 14:52
James watt. - ppt download
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1892-1893 World's Columbian Exposition Isabella Quarter| Commemorative  Coins - American Numismatic Association : American Numismatic Association

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De: BARILOCHENSE6999 Enviado: 13/03/2025 01:14
https://victor-li.com/isabellaquarter/
 

Vindicated by History: The 1893 Queen Isabella Commemorative Quarter

October 4, 2019

A few things I’ve picked up from researching early commemorative coins:

  • The people behind them always hope they can raise a ton of money for a pet project or monument or expo. They rarely do.
  • The designs usually get denigrated by the numismatic press – oftentimes with a venom critics reserve for Limp Bizkit albums or Michael Bay movies.
  • The mint melts down the excess/unsold coins. As a result, the ones that did sell end up becoming valuable decades later – screwing over collectors on a budget like yours truly.

Those issues were all in play for the 1893 Isabella Quarter.

The Queen Isabella commemorative quarter traces its beginnings to the World’s Fair: Columbian Exposition, held in Chicago in 1893. Congress had already authorized the minting of a commemorative half dollar featuring Christopher Columbus, but a group of women, led by Bertha Palmer, whose husband, Potter, owned the famed Palmer House hotel in Chicago, thought they could do better.

Spearheaded by renowned women’s rights activist, and future $1 coin subject, Susan B. Anthony, the Board of Lady Managers had been awarded $10,000 in federal funds to help manage the Columbian Expo. In early 1893, the Board went before the House Appropriations Committee to ask that the $10,000 could be paid to them in the form of 40,000 specially designed commemorative quarters, which they could then sell at a profit. Congress obliged and the Board set about becoming “the authors of the first really beautiful and artistic coin that has ever been issued by the government of the United States.”

Obviously, the Board wanted a female on the obverse and decided on Queen Isabella I of Castile, who had provided vital financial support for Columbus’s voyages. Putting a foreign monarch on U.S. currency was unprecedented (indeed, there had a been a revolution over it), but according to Coin Week, the main source of conflict was over design.

Caroline Peddle, a former student of famed artist and coin designer Augustus Saint-Gaudens, was hired by the Board to design the coin. However, her sketches, which included a seated Isabella on the obverse and the inscription “Commemorative coin issued for the Board of Lady Managers of the World’s Columbian Exposition by Act of Congress, 1492–1892” on the reverse, were deemed to look too token-like and rejected. Rather than be allowed to redesign the coin, the Mint took away the reverse side and gave it to one of their in-house artists, Charles Barber, to design.

After some more back-and-forth and additional restrictions imposed by the Mint, Peddle resigned. The Mint then cobbled together some portraits of Isabella and ultimately produced an image of a young Isabella wearing a crown on her head for the obverse. On the reverse, the Mint went with an image of a woman kneeling while holding a distaff and spindle- symbolizing her industry. The Board had suggested an image of the Woman’s Building at the Expo, and Palmer later stated that the Board disliked the Mint’s reverse image because “we did not consider [it] typical of the woman of the present day.” However, the Mint made the final decision and approved the coin design.

To say that the reception for the commemorative quarter was not warm is a bit like saying that the American public didn’t embrace Apple’s Newton. The American Journal of Numsimatics was particularly brutal:

[W]e do not know who designed it, but in this instance, as in the half dollar, the contrast between examples of the numismatic art of the nation, as displayed on the Columbian coins, on the one hand, and the spirited and admirable work of the architects of the buildings, for instance, on the other, is painful. If these coins really represent the highest achievements of our medalist and our mints, under the inspiration of an opportunity without restrictions, the like of which has never been presented hitherto in the history of our national coinage, we might as well despair of its future…

The American Journal of Numismatics in October 1893, quoted by PCGS.

The Journal also drew a “mournful” comparison between the reverse design of the kneeling woman holding the distaff and spindle and the well-known “Am I Not a Woman and a Sister?” anti-slavery Hard Times Token. Surely, the Board felt vindicated by that line – although there’s no evidence Palmer or anyone else affiliated with them ever wrote to the Mint to say: “See? I told you we should gone with the building on the reverse.”

1838 HT-81 “Am I Not A Woman & A Sister?” (Image via me)

Sales figures, meanwhile, were disappointing. Of the 40,000 coins minted, a little more than half (21,180) ended up selling. According to NGC, the quarter’s sales were cannibalized by the Columbian Expo half dollar, which sold for the same price and was more widely available at the fair (5 million Columbian Expo half dollars were minted – 125 times as many compared to the Isabella quarter). While it didn’t come close to selling out, Coin Week points out that the quarters, which sold for $1 each, ended up being profitable for the Board. A $20,000-plus stream of revenue may not have been much, but it was double the original federal appropriation awarded to the Board. Of the remaining 19,000-plus quarters, approximately 15,000 went back to the Mint for melting.

1893 Columbian Expo Half Dollar. (Image via me)

In recent years, the coin’s reputation has been rehabilitated and has become a highly sought-after collector’s item. Contemporary reviewers have praised its quaint design and its uniqueness among U.S. commemorative coins (until the modern commemoratives came around, it held the distinction as the only commemorative quarter in U.S. history – as well as the only one to depict a foreign monarch). Even the reverse of the coin has been somewhat vindicated. Art historian Cornelius Vermeule argued that the design wasn’t necessarily evocative of the anti-slavery token and even traced elements of it back to antiquities. “[S]ome details of drapery to a servant girl from the East Pediment of the Temple of Zeus at Olympia, work of about 460 B.C. with additions and revisions in the first or second centuries A.D.,” he wrote.

I love the design and how it distinguishes this coin from other early commemoratives. Too many coins from that era have a generic male bust on the obverse and either an eagle or state symbol on the reverse. Because of the relative scarcity of this coin, buying one wasn’t cheap (this one had been cleaned, which lowered its value, but it still ended up costing over $100). The price tag was worth it, as this has become one of my favorite coins.

So I guess the lesson here is that I should buy more modern commemoratives – even those that I think are ugly. After all, maybe they’ll skyrocket in value in 100 years…

https://victor-li.com/isabellaquarter/


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