Scientists confirm Einstein’s supermassive black hole theory

This artist's impression provided by the European Southern Observatory in July 2018 shows the path of the star S2 as it passes close to the supermassive black hole at the center of the Milky Way galaxy. (AP)
Updated 28 July 2018
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Scientists confirm Einstein’s supermassive black hole theory

  • The black hole is 26,000 light years away from Earth and has a mass 4 million times that of the Sun
  • This showed the star’s orbital velocity increasing to more than 25 million kph (15.5 million mph) as it approached the black hole

BERLIN: A team of international scientists observing a star in the Milky Way have for the first time confirmed Einstein’s predictions of what happens to the motion of a star passing close to a supermassive black hole.
Einstein’s 100-year-old general theory of relativity predicted that light from stars would be stretched to longer wavelengths by the extreme gravitational field of a black hole, and the star would appear redder, an effect known as gravitational red shift.
“This was the first time we could test directly Einstein’s theory of general relativity near a supermassive black hole,” Frank Eisenhauer, senior astronomer at the Max Planck Institute for Extraterrestrial Physics, told journalists.
“At the time of Einstein, he could not think or dream of what we are showing today,” he said.
A team of scientists at the European Southern Observatory started monitoring the central area of the Milky Way using its Very Large Telescope to observe the motion of stars near the supermassive black hole 26 years ago.
The black hole is 26,000 light years away from Earth and has a mass 4 million times that of the Sun.
The scientists selected one star, S2, to follow. With an orbit of 16 years, they knew it would return close to the black hole in 2018.
Over 20 years, the accuracy of their instruments has improved and so in May 2018, they were able to take extremely precise measurements in conjunction with scientists from around the world.
This showed the star’s orbital velocity increasing to more than 25 million kph (15.5 million mph) as it approached the black hole.
The star’s wavelength stretched as it sought to escape the gravitational pull of the supermassive black hole, shifting its appearance from blue to red, Odele Straub from the Paris Observatory said.
The scientists now hope to observe other theories of black hole physics, she said.
“This is the first step on a long road that the team has done over many years and which we hope to continue in the next years,” MPE’s Reinhard Genzel, who led the international team, said.


Samsung announces folding phone with 5G — at nearly $2,000

Updated 21 February 2019
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Samsung announces folding phone with 5G — at nearly $2,000

  • The device looks similar to a conventional smartphone, but then opens like a book to reveal a display the size of a small tablet
  • Samsung is also making improvements to its flagship Galaxy S devices and plans to offer a 4G version of its folding phone
SAN FRANCISCO/LONDON: Samsung Electronics Co. Ltd. on Wednesday unveiled a nearly $2,000 folding smartphone in a bid to top the technology of Apple Inc. and Chinese rivals and reignite consumer interest amid slumping sales.
The Galaxy Fold will go on sale on April 26 and take advantage of new and faster 5G mobile networks. The device looks similar to a conventional smartphone, but then opens like a book to reveal a display the size of a small tablet at 7.3 inches (18.5 cm).
The device “answers skeptics who said that everything that could be done has been done,” DJ Koh, chief executive of Samsung Electronics, said at an event in San Francisco. “We are here to prove them wrong.”
Samsung remains the world’s largest smartphone maker with nearly a fifth of global unit sales but underperformed a slumping market last year. Chinese rival Huawei Technologies Co. Ltd. — whose Mate series of phones also command premium prices — gained market share. Other Chinese makers like Xiaomi Corp. have also been increasing prices, leaving Samsung to defend its turf against upstart rivals in addition to its longtime foe Apple.
With the foldable phone, Samsung is going on the offense on two fronts in the smartphone race: It is offering an eye-catching new feature with the big, bending screen and the first 5G connection in a premium phone, a feature analysts do not expect Apple to match until 2020.
Samsung is also making improvements to its flagship Galaxy S devices and plans to offer a 4G version of its folding phone.
It also challenges the notion of what a phone can cost, debuting at nearly twice the price of current top-of-the-line models from Apple and Samsung itself.
Patrick Moorhead, founder of Moor Insights & Strategy, said the new folding device could help Samsung stay at the top and lure consumers to upgrade devices that have looked largely the same over the past five years.
“Samsung and Apple go back and forth” to lead the premium smartphone market, Moorhead said. “I think this is Samsung’s chance to take back the innovation crown.”
And even though the $1,980 starting price is steep, some dedicated Samsung fans said they would pay it. Navneet Kumar Singh, a Samsung enthusiast from India who traveled to San Francisco to watch the launch, is ready to place his order.
“The prices of the flagship models have been a little aggressive in India,” he said, “But in the end, if you invest the money you’re getting a different experience.”
Samsung also introduced several accessories to compete against Apple, including a pair of wireless headphones called Galaxy Buds. The headphones include wireless charging, a feature that Apple has promised to put into is competing AirPods but has not yet released.
Samsung also said that its new Galaxy phones will be able to wirelessly charge its headphones and new smartwatches by setting the accessories on the back of the phone.

10 times faster
Along with the folding phone, Samsung also added new cameras and a 5G version to its Galaxy series of phones.
Verizon Communications Inc. will be the first carrier to offer service for Samsung’s 5G phones. The networks are expected to be 10 times faster than current ones, improving viewing of live news and sports events.
With the 5G versions of its flagships, the Korean electronics maker looks to have beaten Chinese rivals in the 5G race, although the device will operate only on the small number of networks launching later this year. Apple is not expected to release a 5G smartphone until late 2020.
The new networks are not available in many places yet but will roll out this year and next. Consumers who want to hold on to their phones for several years before upgrading may be tempted to buy a 5G phone now so that it will be able to take advantage of those networks later, said Bob O’Donnell of TECHnalysis Research. That could sway some Apple buyers over to Samsung and other Android makers with 5G devices.
“People are going to be thinking about, am going to be able to use this a year from now? Two years from now? Three years?” he said.
Rival smartphone makers are expected to announce 5G models at next week’s Mobile World Congress, the industry’s top annual event, in Spain. Samsung said its 5G handset would be available in the early summer.
The Galaxy 10 series needs to appeal to consumers who are reluctant to upgrade for only incremental technological improvements in performance.
All of the Galaxy series of rigid phones except the 5G will be available from March 8, with the S10+ priced from $1,000, the S10 priced from $900 and the smaller S10e from $750.
The mainline S10 compares with $999 for Apple’s iPhone XS and $858 for Huawei’s premium Mate 20 Pro.