WASHINGTON/CAMBRIDGE, Mass.: Scientists for the first time have detected gravitational waves, ripples in space and time hypothesized by Albert Einstein a century ago, in a landmark discovery announced on Thursday that opens a new window for studying the cosmos.
The researchers said they identified gravitational waves coming from two distant black holes — extraordinarily dense objects whose existence also was foreseen by Einstein — that orbited one another, spiraled inward and smashed together at high speed to form a single, larger black hole.
The waves were unleashed by the collision of the black holes, one of them 29 times the mass of the sun and the other 36 times the solar mass, located 1.3 billion light years from Earth, the researchers said.
“Ladies and gentlemen, we have detected gravitational waves. We did it,” said California Institute of Technology physicist David Reitze, triggering applause at a packed news conference in Washington.
“It’s been a very long road, but this is just the beginning,” Louisiana State University physicist Gabriela Gonzalez told the news conference, hailing the discovery as opening a new era in astronomy.
The scientific milestone was achieved using a pair of giant laser detectors in the United States, located in Louisiana and Washington state, capping a decades-long quest to find these waves.
“The colliding black holes that produced these gravitational waves created a violent storm in the fabric of space and time, a storm in which time speeded up, and slowed down, and speeded up again, a storm in which the shape of space was bent in this way and that way,” Caltech physicist Kip Thorne said.
The scientists first detected the waves last Sept. 14.
The two instruments, working in unison, are called the Laser Interferometer Gravitational-Wave Observatory (LIGO). They detected remarkably small vibrations from the gravitational waves as they passed through the Earth. The scientists converted the wave signal into audio waves and listened to the sounds of the black holes merging.
At the news conference, they played an audio recording of this: a low rumbling pierced by chirps.
“We’re actually hearing them go thump in the night,” Massachusetts Institute of Technology physicist Matthew Evans said. “There’s a very visceral connection to this observation.”
“We are really witnessing the opening of a new tool for doing astronomy,” MIT astrophysicist Nergis Mavalvala said in an interview. “We have turned on a new sense. We have been able to see and now we will be able to hear as well.”
While opening a door to new ways to observe the universe, scientists said gravitational waves should help them gain knowledge about enigmatic objects like black holes and neutron stars. The waves also may provide insight into the mysterious nature of the very early universe.
The scientists said that because gravitational waves are so radically different from electromagnetic waves they expect them to reveal big surprises about the universe.
Einstein’s gravitational waves detected in landmark discovery
Einstein’s gravitational waves detected in landmark discovery
Beijing issues weather warning for hottest days of year
China has endured a string of extreme summers in recent years, with heatwaves baking northern regions even as parts of the south have seen catastrophic rain and flooding.
Authorities in the city of 22 million people urged the public to take precautions, with temperatures expected to peak at around 38 degrees Celsius (100 degrees Fahrenheit) on Monday.
“It’s been really hot lately, especially in the past few days,” intern Li Weijun told AFP on Monday afternoon.
The 22-year-old said he had stopped wearing formal clothes to work and delayed his daily exercise until after 10:00 p.m. to stay safe.
“I think it’s related to climate change, and maybe also to the damage done to nature,” he said.
An orange heat warning — the second-highest in a three-tier system — was issued on Monday as officials encouraged people to limit outdoor activity and drink more fluids to avoid heatstroke.
Construction workers should “shorten the amount of time consecutively spent at labor,” while elderly, sick or weakened individuals ought to “avoid excessive exertion,” according to the guidelines.
Zhang Chen, 28, said she carried an umbrella outdoors to prevent sunburn.
“I used to ride a bike, but once it gets this hot, I basically stop doing that,” the IT worker told AFP.
Despite the beating sun, legions of delivery drivers zipped through downtown areas at noon to bring sustenance to Beijing’s office workers.
A few lazed on the backs of their scooters in a shady spot, while elsewhere, people cooled off with ice creams or by taking a dip in the city’s canals.
Beijing is still a few degrees short of breaking its record for the hottest-ever June day, set at 41.1C in 2023.
Human greenhouse gas emissions are driving climate change that causes longer, more frequent and more intense heatwaves.
China is the world’s largest producer of carbon dioxide, a potent greenhouse gas, though it has pledged to bring its emissions to a peak by the end of this decade and to net zero by 2060.
The country has also emerged as a global leader in renewable energy in recent years as it seeks to pivot its massive economy away from highly polluting coal consumption.
In a shady spot near an office building, 42-year-old Lucy Lu spent her lunch break with friends, kicking a shuttlecock through the air — a traditional Chinese game known as “jianzi.”
“I was born and raised in Beijing, and summer here has always been like this,” she said.
“But I do think when the temperature goes over 40C, there should be some time off or work-from-home options to reduce the risk of heatstroke.”
UK police ban Palestine Action protest outside parliament
- The pro-Palestinian organization is among groups that have regularly targeted defense firms and other companies in Britain linked to Israel since the start of the conflict in Gaza
LONDON: British police have banned campaign group Palestine Action from protesting outside parliament on Monday, a rare move that comes after two of its members broke into a military base last week and as the government considers banning the organization.
The group said in response that it had changed the location of its protest on Monday to Trafalgar Square, which lies just outside the police exclusion zone.
The pro-Palestinian organization is among groups that have regularly targeted defense firms and other companies in Britain linked to Israel since the start of the conflict in Gaza.
British media have reported that the government is considering proscribing, or effectively banning, Palestine Action, as a terrorist organization, putting it on a par with Al-Qaeda or Daesh.
London’s Metropolitan Police said late on Sunday that it would impose an exclusion zone for a protest planned by Palestine Action outside the Houses of Parliament — a popular location for protests in support of a range of causes.
“The right to protest is essential and we will always defend it, but actions in support of such a group go beyond what most would see as legitimate protest,” Met Police Commissioner Mark Rowley said.
“We have laid out to Government the operational basis on which to consider proscribing this group.”
Palestine Action’s members are alleged to have caused millions of pounds of criminal damage, assaulted a police officer with a sledgehammer and, in the incident last week, damaged two military aircraft, Rowley added.
Italy against suspending EU-Israel accord, foreign minister says
ROME: Italy is against a suspension of the EU-Israel Association Agreement over alleged human rights violations in Gaza, Foreign Minister Antonio Tajani said on Monday.
“Our position is different from that of Spain,” Tajani said on the sidelines of a meeting with EU colleagues in Brussels, referring to Spain’s support for a suspension of the deal.
Tajani said it was important to keep relations open with Israel, saying that this had facilitated the evacuation of some civilians out of Gaza.
In Norway’s Arctic, meteorologists have a first-row seat to climate change
TROMSO: In the cold of the Norwegian Arctic, meteorologist Trond Robertsen manually recorded precipitation levels for over two decades, witnessing firsthand the effects of climate change.
At 66, Robertsen retired after enduring spartan conditions during missions that totalled eight years on two islands of the Svalbard archipelago: Bjornoya (Bear Island) and Hogen.
To reach the remote Bjornoya, where the only humans are the nine employees of the small weather station, the meteorologists have to fly in by helicopter as they are rotated on a six-month basis.
“The idea is to not stay too long, because it’s a different rhythm, and you are isolated,” Robertsen told AFP.
It is demanding work.
“It’s a 24/7 occupation,” he said. “We are doing it all day, all night.” The team worked shifts to cover all hours of the day, he explained.
Weather observation starts in the early morning at 6:00 am.
“It’s manually done, then you have to go outside and check the bucket that is collecting precipitation,” said Robertsen.
“During wintertime you have to melt the snow and ice into water” to determine how much has fallen.
The data is then transmitted the Norwegian Meteorological Institute in Tromso and Oslo.
“This tiny little observation is actually quite crucial for the weather forecasting systems up north, because observations are so sparse from that area.”
Bjornoya sits in the middle of fishing grounds, and the weather reports published twice a day are closely followed by the fishing boats in the area.
Since his first missions to the Arctic in the 1990s, Robertsen has witnessed the changing climate.
“When I started going up north, there was a lot of ice. In the later years, it’s less ice and fewer polar bears. You can see the climate change,” he said.
Polar bears have been classified as a vulnerable population since 1982 on the IUCN (International Union for Conservation of Nature) Red List of Threatened Species, with the loss of Arctic sea ice the most pressing threat against the species.
However, their precise numbers, are almost impossible to assess.
In winter, employees of station always venture out in pairs and have to be armed due to the presence of polar bears, but according to Robertsen it’s rarer to encounter them today.
In April, during his last mission to the island, Robertsen had an accident while doing carpentry: he slipped and ended up cutting one finger clean off and half of another.
Due to tough weather conditions, he had to wait some 26 hours before being evacuated by helicopter and transported to a hospital.
“It was a heavy snowstorm coming in, only the day after the helicopter came,” he recounted.
Looking back, Robertsen does not regret the years spent under the austere living conditions.
“The Arctic has given me so many experiences and memories so it is a small fee to pay back with my left little finger and part of my ring finger,” he said.
More evacuation orders issued as firefighters battle major wildfire on the Greek island of Chios
ATHENS: Greek authorities sent new evacuation notifications for two areas near the main town of the eastern Aegean island of Chios Monday morning, as firefighters struggled to control a major wildfire raging on the town’s outskirts for a second day.
The fire department said 190 firefighters were battling the blaze Monday. They were backed up by 35 vehicles, five helicopters and two water-dropping planes. Strong winds in the area since Sunday have hampered firefighting efforts.
Push alerts have been sent to mobile phones in the area urging people to evacuate a total of 16 villages, settlements and neighborhoods on the outskirts of Chios town since the blaze broke out on Sunday.
The fire started in three separate locations. Authorities have sent a specialist fire department arson investigation team to the island to look into the causes.
Wildfires are frequent in Greece during its hot, dry summers, but authorities have said climate change has been fueling bigger and more frequent blazes.
In 2018, a massive fire swept through the seaside town of Mati, east of Athens, trapping people in their homes and on roads as they tried to flee. More than 100 people died, including some who drowned trying to swim away from the flames.
