|A 'CT scan' of the Universe across more than 5 billion light-years. (D. Schlegel/Berkeley Lab/DESI data|
The Dark Energy Spectroscopic Instrument (DESI), currently pointed skyward from its home in the Nicholas U. Mayall Telescope at the Kitt Peak National Observatory in Arizona, is tasked with tracking the expansion of space, to study dark energy and create the most detailed 3D map. of the Universe that was never assembled.
It's only been seven months since the DESI mission began, and we already have a record-breaking, stunning three-dimensional image of the galaxy all around us, demonstrating DESI's capabilities and potential for mapping space.
DESI has already cataloged and tracked over 7.5 million galaxies, with over a million new additions per month. When the scan is fully completed in 2026, more than 35 million galaxies would have been mapped, giving astronomers a huge library of data to mine.
"There's a lot of beauty in there," says Lawrence astrophysicist Julien guy in California. "In the distribution of galaxies on the 3D map, there are huge clusters, filaments and voids.These are the largest structures in the Universe.
But within them you will find an imprint of the early Universe and the story of its expansion since DESI is made up of 5,000 optical fibers, each individually controlled and positioned ionized by its own little robot These fibers must be precisely positioned within 10 microns, less than the thickness of a human hair, then catch glimpses of light as they filter through the Earth of the cosmos.
Through this fiber network, the instrument takes color spectrum images of millions of galaxies, covering more than a third of the entire sky, before calculating how much the light has been redshifted – that is, how much it's been pushed towards the red end of the spectrum due to the expansion of the Universe.
As this light can take up to several billion years to reach Earth, it's possible to use redshift data to see depth in the Universe: the greater the redshift, the farther away something is. What's more, the structures mapped by DESI can be reverse engineered to see the initial formation that they started out in.
The main objective of DESI is to reveal more about the dark energy that is thought to make up 70 percent of the Universe as well as speeding up its expansion. This dark energy could drive galaxies into an infinite expansion, cause them to collapse back on themselves or something in between – and cosmologists are keen to narrow down the options.
[DESI] will help us search for clues about the nature of dark energy,” Carlos Frenk, a cosmologist at Durham University in the UK, told the BBC. We will also learn more about dark matter and the role it plays in how it happens, forms galaxies such as the Milky Way, and how the universe evolves.
The 3D map that has already been released shows that scientists don't have to wait for DESI to finish its work to start benefiting from its deep look into space explores whether or not small galaxies have their own black holes like large galaxies.
The best way to spot a black hole is to identify the gas, dust and other material dragged into it, but that's not easy to see in small galaxies - something where high-precision spectral data collected by DESI should help. Then there's the study of quasars, particularly bright galaxies powered by supermassive black holes, which serve as clues to billions of years of space history.
DESI will be used to test a hypothesis around quasars: that they start out surrounded by an envelope of dust that is chased away over time. The amount of dust around a quasar is believed to affect the color of the light it emits, making it a perfect job for DESI.
The tool should be able to collect information on around 2.4 million quasars before its survey is complete."DESI is really great because it collects much fainter, much redder objects," says Durham University astronomer Victoria Fawcett.
"We're finding quite a few exotic systems, including large samples of rare objects that we've simply never seen able to study in detail before.
|A man holds a laptop computer as cyber code is projected on him in this illustration picture taken on May 13, 2017. REUTERS/Kacper Pempel/Illustration|
The White House will meet with executives from major tech companies, including Alphabet-owned Google (GOOGL.O), Apple Inc (AAPL.O) and Amazon.com Inc, , to discuss software security after the United States have suffered several major cyber attacks last year.In December, White House National Security Advisor Jake Sullivan sent a letter to CEOs of tech companies after a security vulnerability was discovered in open source software called Log4j that organizations around the world are using. to save data in their applications.
In the letter, Sullivan noted that this open source software is widely used and maintained by volunteers and is a "major national security problem."
Thursday's meeting, which will be hosted by the Deputy National Security Advisor for Information Technology and Emerging Technologies. discuss concerns about the security of open source software and how it can be improved, the White House said in a statement.
Other top tech companies in attendance at the meeting will include IBM (IBM.N), Microsoft Corp (MSFT.O), Meta Platforms Inc (FB.O) which owns Facebook and Oracle Corp (ORCL.N). Government agencies, including the Department of Homeland Security, Department of Defense and the Commerce Department, will also be in attendance.
Cybersecurity has been a top priority for the Biden administration after several major cyberattacks last year, which exposed thousands of records held by companies and government agencies to hackers.
One hack, which the U.S. government has said was likely orchestrated by Russia, breached software made by SolarWinds (SWI.N) and gave hackers access to thousands of companies and government offices that used its products. The hackers got access to emails at the U.S. Treasury, Justice and Commerce departments, and other agencies.
|The Yutu-2 image of the ‘mysterious hut’. (CNSA/CLEP/Our Space)|
|Yutu-2 image of the closer rock. (CNSA/CLEP/Our Space)|
|A closer look at the rock. (CNSA/CLEP/Our Space)|
|Credits: NASA GSFC/CIL/Adriana Manrique Gutierrez|
NASA's James Webb Space Telescope team has fully deployed its 21-foot gold-plated primary mirror, completing the final phase of all major spacecraft deployments in preparation for scientific operations.
As a joint effort with the European Space Agency (ESA) and the Canadian Space Agency, the Webb mission will explore every phase of cosmic history, from the solar system to the most distant observable galaxies in the early universe.
The two wings of Webb's primary mirror were bent prior to launch to fit into the nose cone of an Arianespace Ariane 5 rocket. After more than a week of other critical spacecraft missions, Webb's team began remotely deploying the hexagonal segments of the main mirror, the largest ever launched on launch. Place.
The telescope will now begin moving its 18 primary mirror segments to align the telescope optics. The ground team will command 126 actuators on the backsides of the segments to flex each mirror – an alignment that will take months to complete. Then the team will calibrate the science instruments prior to delivering Webb’s first images this summer.
Thomas Zurbuchen, Associate Administrator for Science Mission Directorate in NASA Headquarters in Washington, added: “I am so proud of the team – spanning continents and decades – that delivered this first-of-its-kind achievement. Webb’s successful deployment exemplifies the best of what NASA has to offer: the willingness to attempt bold and challenging things in the name of discoveries still unknown.”
Webb will also shortly undergo a third midway correction burn - one of three designed to bring the telescope into precise orbit around the second Lagrangian point, commonly known as L2, nearly 1 million miles from Earth. This is Webb's last orbital position where his sunshade protects him from light from the sun, earth, and moon that could interfere with infrared light observations. Webb was designed to look back over 13.5 billion years to capture infrared light from celestial objects in much higher resolution than ever before and to study our own solar system as well as distant worlds.
Gregory L. Robinson, Director of the Webb Program at NASA Headquarters, said, “The successful completion of all Webb space telescope missions is historic. This is the first time a NASA-led mission attempts to complete a complex sequence of observatory in space, a remarkable feat for our team, NASA, and the world.
|Walmart signs are displayed inside a Walmart store in Mexico City, Mexico March 28, 2019. REUTERS/Edgard Garrido/File Photo|
Chinese authorities rapped Walmart for allegedly breaking cybersecurity laws, according to local media, the latest issue for retailer U.S which is already the subject of allegations in the country for allegedly halting sales of products from the Xinjiang.
Police in southern China's Shenzhen city discovered 19 "vulnerabilities" in Walmart's network system (WMT.N) in late November and accused them of taking a long time to fix the flaws the China Quality News, backed by the country's market regulator, reported on Wednesday.
Walmart was ordered to make fixes, the report said, without mentioning fines or details of the vulnerabilities.
The retail giant and the Shenzhen police did not immediately respond to requests for comment on Friday.
This marks a fresh set of troubles in China for Walmart, which in the past month has faced criticism for what local media has said was its deliberate removal of products sourced from Xinjiang from its apps and stores.
Xinjiang is a growing point of conflict between the Western governments and China, as U.N. experts and rights groups estimate more than a million people, mainly Uyghurs and members of other Muslim minorities, have been detained in camps there.
China has rejected accusations of forced labour or any other abuses in the far western region.
Walmart has seen a wave of membership cancellations of its arm Sam's Club branch in China since the Xinjiang problem.
The Chinese transplant agency also accused the retailer and the Sam's Club of "stupidity and myopia".
Although Walmart has not commented publicly on the matter, Reuters reported that a Sam's Club executive told analysts during a phone call that it was a "misunderstanding" and that there had been no deliberate withdrawal of products from Xinjiang fined 10,000 yuan ($ 1,568) in Shanghai by the city's market regulator for violating food safety laws after discovering that a frozen plant product did not have a production date or of expiration date, according to a separate report released by local media.
Elon Musk's SpaceX provided an update on its Starlink internet service on Thursday, as the company launched more satellites into orbit.
SpaceX engineer Jessie Anderson said during a webcast of the company's first launch of the year that Starlink now has more than 145,000 users in 25 countries around the world. It fell from 140,000 users in early November, but represents a slowdown in user growth.
On Thursday, the company launched a Falcon 9 rocket from Florida, carrying 49 Starlink satellites into orbit.
Starlink is the company's plan to build an interconnected Internet network with thousands of satellites - known in the space industry as a constellation.
It is designed to provide high speed Internet access to consumers all over the planet. SpaceX has approximately 1,800 Starlink satellites in orbit.
The increase of 5,000 users in two months represents slower growth. As of November, SpaceX had added about 11,000 users per month since the service began in October 2020.
Late last year, SpaceX noted on its website that the "silicon shortage has delayed production" of Starlink user terminals, “which impacted our ability to fulfill orders.
SpaceX's valuation has reached over $100 billion, which industry analysts attribute largely to the market potential of its Starlink service.