For the first time, scientists have witnessed the cataclysmic crash of two ultra-dense neutron stars in a galaxy far away and concluded that such impacts forged at least half the gold in the universe.
Shock waves and light flashes from the collision traveled about 130 million light-years to be captured by detectors on Earth on Aug. 17, excited teams revealed at news conferences held around the globe on Monday as a dozen related science papers were published in top academic journals.
“We witnessed history unfolding in front of our eyes: two neutron stars drawing closer, closer ... turning faster and faster around each other, then colliding and scattering debris all over the place,” joint discoverer Benoit Mours of France’s CNRS research institute said.
Photo: AFP
The groundbreaking observation solved a number of physics riddles and sent ripples of excitement through the scientific community.
Most jaw-dropping for many, the data finally revealed where much of the gold, platinum, uranium, mercury and other heavy elements in the universe come from.
Telescopes saw evidence of newly-forged material in the fallout, the teams said — a source long suspected, now confirmed.
“It makes it quite clear that a significant fraction, maybe half, maybe more, of the heavy elements in the universe are actually produced by this kind of collision,” said physicist Patrick Sutton, a member of the US-based Laser Interferometer Gravitational-Wave Observatory (LIGO), which contributed to the find.
Neutron stars are the condensed, burnt-out cores that remain when massive stars run out of fuel, blow up and die. Typically about 20km in diameter, but with more mass than the sun, they are highly radioactive and ultra-dense — a handful of material from one weighs as much as Mount Everest.
It had been theorized that mergers of two such exotic bodies would create ripples in the fabric of space-time known as gravitational waves, as well as flashes of high-energy radiation called gamma ray bursts.
On Aug. 17, detectors witnessed both phenomena, 1.7 seconds apart, coming from the same spot in the constellation of Hydra.
“It was clear to us within minutes that we had a binary neutron star detection,” said David Shoemaker, another member of LIGO, which has detectors in Livingston, Louisiana, and Hanford, Washington. “The signals were much too beautiful to be anything but that.”
The observation was the fruit of years of labor by thousands of scientists.
Along with LIGO, they include teams from Europe’s Virgo gravitational wave detector in Italy, and a number of ground and space-based telescopes, including NASA’s Hubble.
“This event marks a turning point in observational astronomy and will lead to a treasure trove of scientific results,” said Bangalore Sathyaprakash from Cardiff University’s School of Physics and Astronomy, recalling “the most exciting [discovery] of my scientific life.”
“It is tremendously exciting to experience a rare event that transforms our understanding of the workings of the universe,” added France Cordova, director of the National Science Foundation, which funds LIGO.
The detection is another feather in the cap for physicist Albert Einstein, who predicted gravitational waves more than 100 years ago.
Three LIGO pioneers — Barry Barish, Kip Thorne and Rainer Weiss — were awarded the Nobel Prize in Physics this month for the observation of gravitational waves, without which the latest discovery would not have been possible.
The ripples have been observed four times before now — the first time by LIGO in September 2015. All four were from mergers of black holes, which are even more violent than neutron star collisions, but emit no light.
The fifth and latest detection was accompanied by a gamma ray burst which scientists said came from nearer in the universe and was less bright than expected.
“What this event is telling us is that there may be many more of these short gamma ray bursts going off nearby in the universe than we expected,” Sutton said — an exciting prospect for scientists hoping to uncover further secrets of the universe.
Among other things, it is hoped that data from neutron star collisions will allow the definitive calculation of the rate at which the cosmos is expanding, which in turn will tell us how old it is and how much matter it contains.
“With these observations we are not just learning what happens when neutron stars collide, we’re also learning something fundamental about the nature of the universe,” said Julie McEnery of the Fermi gamma ray space telescope project.
PHISHING: The con might appear convincing, as the scam e-mails can coincide with genuine messages from Apple saying you have run out of storage For a while you have been getting messages from Apple saying “your iCloud storage is full.” They say you have exceeded your storage plan, so documents are no longer being backed up, and photos you take are not being uploaded. You have been resisting Apple’s efforts to get you to pay a minimum of ￡0.99 (US$1.33) a month for more storage, but it seems that you cannot keep putting off the inevitable: You have received an e-mail which says your iCloud account has been blocked, and your photos and videos would be deleted very soon. To keep them you need
For two decades, researchers observed members of the Ngogo chimpanzee group of Kibale National Park in Uganda spend their days eating fruits and leaves, resting, traveling and grooming in their tropical rainforest abode, but this stable community then fractured and descended into years of deadly violence. The researchers are now describing the first clearly documented example of a group of wild chimpanzees splitting into two separate factions, with one launching a series of coordinated attacks against the other. Adult males and infants were targeted, with 28 deaths. “Biting, pounding the victim with their hands, dragging them, kicking them — mostly adult males,
The Israeli military has demolished entire villages as part of its invasion of south Lebanon, rigging homes with explosives and razing them to the ground in massive remote detonations. The Guardian reviewed three videos posted by the Israeli military and on social media, which showed Israel carrying out mass detonations in the villages of Taybeh, Naqoura and Deir Seryan along the Israel-Lebanon border. Lebanese media has reported more mass detonations in other border villages, but satellite imagery was not readily available to verify these claims. The demolitions came after Israeli Minister of Defense Israel Katz called for the destruction of
SUPERFAN: The Japanese PM played keyboard in a Deep Purple tribute band in middle school and then switched to drums at university, she told the British rock band Legendary British rock band Deep Purple yesterday made Japanese Prime Minister Sanae Takaichi’s day with a brief visit to their high-profile superfan as they returned to the nation they first toured more than half a century ago. Takaichi’s reputation as an amateur drummer, and a fan of hard rock and heavy metal has been well documented, and she has referred to Deep Purple as one of her favorite bands along with the likes of Black Sabbath and Iron Maiden. “You are my god,” a giddy Takaichi said in English to Deep Purple drummer Ian Paice, presenting him with a set of made-in-Japan
RSS