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James Webb Space Telescope images reveal the wonders of the universe

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(Last Updated On: December 25, 2022)

It is no exaggeration to say the James Webb Space Telescope (JWST) represents a new era for modern astronomy.

Launched on December 25 last year and fully operational since July, the telescope offers glimpses of the universe that were inaccessible to us before. Like the Hubble Space Telescope, the JWST is in space, so it can take pictures with stunning detail free from the distortions of Earth’s atmosphere, interestingengineering.com reported.

However, while Hubble is in orbit around Earth at an altitude of 540km, the JWST is 1.5 million kilometers distant, far beyond the Moon. From this position, away from the interference of our planet’s reflected heat, it can collect light from across the universe far into the infrared portion of the electromagnetic spectrum.

This ability, when combined with the JWST’s larger mirror, state-of-the-art detectors, and many other technological advances, allows astronomers to look back to the universe’s earliest epochs.

As the universe expands, it stretches the wavelength of light traveling toward us, making more distant objects appear redder. At great enough distances, the light from a galaxy is shifted entirely out of the visible part of the electromagnetic spectrum to the infrared. The JWST is able to probe such sources of light right back to the earliest times, nearly 14 billion years ago, read the report.

According to interestingengineering.com, the Hubble telescope continues to be a great scientific instrument and can see at optical wavelengths where the JWST cannot. But the Webb telescope can see much further into the infrared with greater sensitivity and sharpness.

The website has highlighted ten images that have demonstrated the staggering power of this new window to the universe.

1. Mirror alignment complete


Despite years of testing on the ground, an observatory as complex as the JWST required extensive configuration and testing once deployed in the cold and dark of space.

One of the biggest tasks was getting the 18 hexagonal mirror segments unfolded and aligned to within a fraction of a wavelength of light. In March, NASA released the first image (centered on a star) from the fully aligned mirror. Although it was just a calibration image, astronomers immediately compared it to existing images of that patch of sky – with considerable excitement.

2. Spitzer vs. MIRI


This early image, taken while all the cameras were being focused, clearly demonstrates the step change in data quality that JWST brings over its predecessors.

On the left is an image from the Spitzer telescope, a space-based infrared observatory with an 85cm mirror; the right, the same field from JWST’s mid-infrared MIRI camera and 6.5m mirror. The resolution and ability to detect much fainter sources is on show here, with hundreds of galaxies visible that were lost in the noise of the Spitzer image. This is what a bigger mirror situated out in the deepest, coldest dark can do.

3. The first galaxy cluster image


The galaxy cluster with the prosaic name of SMACS J0723.3–7327 was a good choice for the first color images released to the public from the JWST.

The field is crowded with galaxies of all shapes and colors. The combined mass of this enormous galaxy cluster, over 4 billion light years away, bends space in such a way that light from distant sources in the background is stretched and magnified, an effect known as gravitational lensing.

These distorted background galaxies can be clearly seen as lines and arcs throughout this image. The field is already spectacular in Hubble images (left), but the JWST near-infrared image (right) reveals a wealth of extra detail, including hundreds of distant galaxies too faint or too red to be detected by its predecessor.

4. Stephan’s Quintet


These images depict a spectacular group of galaxies known as Stephan’s Quintet, a group that has long been of interest to astronomers studying the way colliding galaxies interact with one another gravitationally.

On the left we see the Hubble view, and the right the JWST mid-infrared view. The inset shows the power of the new telescope, with a zoom-in on a small background galaxy. In the Hubble image we see some bright star-forming regions, but only with the JWST does the full structure of this and surrounding galaxies reveal itself.

5. The Pillars of Creation


The so-called Pillars of Creation is one of the most famous images in all of astronomy, taken by Hubble in 1995. It demonstrated the extraordinary reach of a space-based telescope.

It depicts a star-forming region in the Eagle Nebula, where interstellar gas and dust provide the backdrop to a stellar nursery teeming with new stars. The image on the right, taken with the JWST’s near-infrared camera (NIRCam), demonstrates a further advantage of infrared astronomy: the ability to peer through the shroud of dust and see what lies within and behind.

6. The ‘Hourglass’ Protostar


This image depicts another act of galactic creation within the Milky Way. This hourglass-shaped structure is a cloud of dust and gas surrounding a star in the act of formation – a protostar called L1527.

Only visible in the infrared, an “accretion disk” of material falling in (the black band in the center) will eventually enable the protostar to gather enough mass to start fusing hydrogen, and a new star will be born.

In the meantime, light from the still-forming star illuminates the gas above and below the disk, making the hourglass shape. Our previous view of this came from Spitzer; the amount of detail is once again an enormous leap ahead.

7. Jupiter in infrared


The Webb telescope’s mission includes imaging the most distant galaxies from the beginning of the universe, but it can look a little closer to home as well.

Although JWST cannot look at Earth or the inner Solar System planets – as it must always face away from the Sun – it can look outward at the more distant parts of our Solar System. This near-infrared image of Jupiter is a beautiful example, as we gaze deep into the structure of the gas giant’s clouds and storms. The glow of auroras at both the northern and southern poles is haunting.

This image was extremely difficult to achieve due to the fast motion of Jupiter across the sky relative to the stars and because of its fast rotation. The success proved the Webb telescope’s ability to track difficult astronomical targets extremely well.

8. The Phantom Galaxy


These images of the so-called Phantom Galaxy or M74 reveal the power of JWST not only as the latest and greatest of astronomical instruments but as a valuable complement to other great tools. The middle panel here combines visible light from Hubble with infrared from Webb, allowing us to see how starlight (via Hubble) and gas and dust (via JWST) together shape this remarkable galaxy.

Much JWST science is designed to be combined with Hubble’s optical views and other imaging to leverage this principle.

9. A super-distant galaxy


Although this galaxy – the small, red blob in the right image – is not among the most spectacularly picturesque our universe has to offer, it is just as interesting scientifically.

This snapshot is from when the universe was a mere 350 million years old, making this among the very first galaxies ever to have formed. Understanding the details of how such galaxies grow and merge to create galaxies like our own Milky Way 13 billion years later is a key question, and one with many remaining mysteries, making discoveries like this highly sought after.

It is also a view only the JWST can achieve. Astronomers did not know quite what to expect; an image of this galaxy taken with Hubble would appear blank, as the light of the galaxy is stretched far into the infrared by the expansion of the universe.

10. This giant mosaic of Abell 2744


This image is a mosaic (many individual images stitched together) centered on the giant Abell 2744 galaxy cluster, colloquially known as “Pandora’s Cluster”. The sheer number and variety of sources that the JWST can detect are mind-boggling; with the exception of a handful of foreground stars, every spot of light represents an entire galaxy.

In a patch of dark sky no larger than a fraction of the full Moon there are umpteen thousands of galaxies, really bringing home the sheer scale of the universe we inhabit.

Professional and amateur astronomers alike can spend hours scouring this image for oddities and mysteries.

Over the coming years, JWST’s ability to look so deep and far back into the universe will allow us to answer many questions about how we came to be. Just as exciting are the discoveries and questions we cannot yet foresee. When you peel back the veil of time as only this new telescope can, these unknown unknowns are certain to be fascinating, interestingengineering.com reported.

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TikTok to label AI-generated content from OpenAI and elsewhere

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(Last Updated On: May 10, 2024)

TikTok plans to start labelling images and video uploaded to its video-sharing service that have been generated using artificial intelligence, it said on Thursday, using a digital watermark known as Content Credentials, Reuters reported.

Researchers have expressed concern that AI-generated content could be used to interfere with U.S. elections this fall, and TikTok was already among a group of 20 tech companies that earlier this year signed an accord pledging to fight it.

The company already labels AI-generated content made with tools inside the app, but the latest move would apply a label to videos and images generated outside of the service.

“We also have policies that prohibit realistic AI that is not labeled, so if realistic AI (generated contents) appears on the platform, then we will remove it as violating our community guidelines,” Adam Presser, head of operations and trust and safety at TikTok, said in an interview.

The Content Credentials technology was spearheaded by the Coalition for Content Provenance and Authenticity, a group co-founded by Adobe (ADBE.O), opens new tab, Microsoft (MSFT.O), opens new tab and others, but is open for other companies to use, read the report.

It has already been adopted by the likes of ChatGPT creator OpenAI.

YouTube, owned by Alphabet’s (GOOGL.O), opens new tab Google, and Meta Platforms (META.O), opens new tab, which owns Instagram and Facebook, have also said they plan to use Content Credentials.

For the system to work, both the maker of the generative AI tool used to make content and the platform used to distribute the contents must both agree to use the industry standard.

When a person uses OpenAI’s Dall-E tool to generate an image, for example, OpenAI attaches a watermark to the resulting image and adds data to the file that can later indicate whether it has been tampered with, Reuters reported.

If that marked image is then uploaded to TikTok, it will be automatically labeled as AI-generated.

TikTok, which is owned by China’s ByteDance, has 170 million users in the U.S., which recently passed a law requiring ByteDance to divest TikTok or face a ban. TikTok and ByteDance have sued to block the law, arguing it violates the First Amendment.

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China launches historic mission to retrieve samples from far side of the moon

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(Last Updated On: May 3, 2024)

China on Friday launched an uncrewed spacecraft on a nearly two-month mission to retrieve rocks and soil from the far side of the moon, the first country to make such an ambitious attempt.

The Long March-5, China’s largest rocket, blasted off at 5:27 p.m. Beijing time (0927 GMT) from Wenchang Space Launch Center on the southern island of Hainan with the more than 8 metric ton Chang’e-6 probe.

Chang’e-6 is tasked with landing in the South Pole-Aitken Basin on the far side of the moon, which perpetually faces away from the Earth, after which it will retrieve and return samples.

The launch marks another milestone in China’s lunar and space exploration programme.

“It is a bit of a mystery to us how China has been able to develop such an ambitious and successful programme in such a short time,” said Pierre-Yves Meslin, a French researcher working on one of the scientific objectives of the Chang’e-6 mission.

In 2018, Chang’e-4 gave China its first unmanned moon landing, also on the far side. In 2020, Chang’e-5 marked the first time humans retrieved lunar samples in 44 years, and Chang’e-6 could make China the first country to retrieve samples from the moon’s “hidden” side.

FOREIGN PAYLOADS

The launch was attended by scientists, diplomats and space agency officials from France, Italy, Pakistan, and the European Space Agency, all of which have moon-studying payloads aboard Chang’e-6.

But no U.S. organisations applied to get a payload spot, according to Ge Ping, deputy director of the China National Space Administration’s (CNSA) Lunar Exploration and Space Program.

China is banned by U.S. law from any collaboration with the U.S. space agency, NASA.

“The far side of the moon has a mystique perhaps because we literally can’t see it, we have never seen it apart from with robotic probes or the very few number of humans that have been around the other side,” said Neil Melville-Kenney, a technical officer at ESA working with Chinese researchers on one of the Chang’e-6 payloads.

After the probe separates from the rocket, it will take four to five days to reach the moon’s orbit. In early June a few weeks later, it will land.

Once on the moon, the probe will spend two days digging up 2 kilogrammes (4.4 lb) of samples before returning to Earth, where it is expected to land in Inner Mongolia.

The window for the probe to collect samples on the far side is 14 hours, compared to 21 hours for the near side.

The samples brought back by Chang’e-5 allowed Chinese scientists to uncover new details about the moon, including more accurately dating the timespan of volcanic activity on the moon, as well as a new mineral.

Ge said the scientific value of Chang’e-6 lay in the geological age of the South Pole-Aitken Basin, which his team estimated was about 4 billion years, much older than the samples previously brought back by the Soviet Union and the United States, which were about 3 billion years old, as well as the 2-billion-year-old samples from Chang’e-5.

LUNAR BASE

Besides uncovering new information about the celestial body closest to Earth, Chang’e-6 is part of a long-term project to build a permanent research station on the moon: the China and Russia-led International Lunar Research Station (ILRS).

The construction of such a station would provide an outpost for China and its partners to pursue deep space exploration.

“We know that the moon may have resources that could become useful in the future, so the European Space Agency, NASA, the Chinese agency and others around the world are going to the moon,” said James Carpenter, head of the ESA’s lunar science office.

“Part of the rationale is to understand those resources,” Carpenter said.

Wu Weiren, chief designer of the Chinese Lunar Exploration Project, speaking at the 2024 China Space Conference last month, said a “basic model” of the ILRS would be built by 2035.

 

(Reuters)

 

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Apple set for big sales decline as investors await AI in iPhones

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(Last Updated On: May 2, 2024)

Apple’s (AAPL.O), opens new tab plan to add generative AI to its iPhones and revive sagging sales in the crucial Chinese market will be in focus on Thursday, when the tech giant is expected to report its biggest quarterly revenue decline in more than a year, Reuters reported.

Long considered a must-own stock on Wall Street, Apple shares have underperformed other Big Tech companies in recent months, falling more than 10% this year as fears mount about its slow roll-out of artificial intelligence services and as a resurgent Huawei (HWT.UL) takes market share in China.

Analysts on average see iPhone sales, which account for about half of Apple’s revenue, falling 10.4% in the first three months of 2024, according to LSEG. That drop would be the steepest in more than three years.

The year-ago iPhone revenue that the 10.4% iPhone sales drop is measured against was unusually high as Apple satisfied pent-up demand after the COVID pandemic, company executives previously noted.

At least $5 billion of the $51.3 billion in iPhone sales a year ago was essentially catching up from disruptions in the December 2022 quarter when COVID lockdowns in China hampered iPhone production, executives said.

Even with that factored in, Wall Street expects a slight decline in iPhone sales, and analysts estimate Apple’s total revenue declined 5% in its fiscal second quarter ended in March. That would be Apple’s biggest revenue decline since the December 2022 quarter, when revenue fell 5.5%, read the report.

Apple earlier this year lost the crown of the world’s most valuable company to Microsoft (MSFT.O), opens new tab. Its market value stands at $2.68 trillion after the share price declined 11.24% so far this year.

Weak revenue and falling shares have pressured Apple to spruce up its flagship device after years without major upgrades.

The company is in talks with OpenAI and Alphabet-owned Google to add genAI features for the iPhone that could be unveiled at what is expected to be its biggest-ever annual developer conference in June, Bloomberg News has reported.

According to Reuters analysts believe such an AI integration could drive demand for the next iPhone series, expected to be announced in the fall.

While executives at Microsoft, Alphabet (GOOGL.O), opens new tab, Meta Platforms (META.O), opens new tab and other major technology firms have talked up their AI strategies on quarterly conference calls in recent months, Apple CEO Tim Cook has discussed his plans for the emerging technology much less.

Adding AI features to iPhones could also help Apple to compete better with Huawei and Samsung Electronics (005930.KS), opens new tab, which reclaimed the title of the world’s top smartphone vendor from Apple this year, driven by demand for the AI features in its Galaxy S24 smartphones.

“Replacement cycle tailwinds and incremental generative AI features set up Apple well for a strong iPhone 16 cycle,” Bernstein analyst Toni Sacconaghi said this week as he upgraded the company’s shares to “outperform” from “market-perform.”

“We believe prevailing weakness in China is more cyclical than structural, and note historically Apple’s China business has exhibited much higher volatility than Apple overall, given its very feature-sensitive installed base.”

Thursday’s earnings will also be watched closely for updates on the company’s stock buyback plan and the Vision Pro, Apple’s first major product in years that hit the shelves in February.

After initial enthusiasm, there have been signs that demand slowed for the $3,500 device, with an analyst saying this month that Apple has pulled back its production estimates for the mixed-reality headset.

The rest of the company’s hardware business is also reeling from soft demand, with iPads and Mac sales expected to fall 11.4% and 4.3%, respectively, in the March quarter, Reuters reported.

Apple has signaled it is sharpening its focus on the devices, which have also been hobbled by a lack of major upgrades.

At an Apple event this month, a revamped iPad line-up is expected to be unveiled and media reports have said that it plans to update every Mac model with faster, AI-focused M4 processors.

The services business, which includes App Store and subscription services such as Apple TV, is expected to remain a bright spot with revenue growth of 7.7%.

Apple shares closed down 0.6% at $169.30 on Wednesday.

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