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Astronomers detect largest cosmic explosion in history

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At a distance of 8 billion light years, when the universe was only 6 billion years old, the most powerful explosion ever observed occurred. Astronomers believe that a huge cloud of gas or dust fell into a black hole.

A team from the University of Southampton detected a distant cosmic explosion twice as bright as the largest supernova ever recorded and three times as bright as the largest known case of a star being engulfed by a black hole. The explosion, referred to as AT2021lwx, has already lasted three years, while supernovae, for example, fizzle out after a few months.

According to experts, AT2021lwx is the result of a black hole ripping apart and absorbing a cloud of gas or dust probably thousands of times larger than the Sun.

The sucked-up fragments of the cloud send shock waves to the rest of the cloud and to the large, dust-composed ring surrounding the black hole. Such events are extremely rare and nothing on this scale has been observed before, astronomers point out.

So far, the brightest known explosion was the GRB 221009A gamma-ray burst recorded last year. Although it had a higher brightness, it lasted only a fraction of the persistence of AT2021lwx.

The unusual explosion was first spotted in 2020, with the help of the Zwicky Transient Facility instrument in California. Later, the observations were taken over by the Asteroid Terrestrial-impact Last Alert System (ATLAS) in Hawaii. The instruments scour the skies for various objects that strongly change their brightness, such as the aforementioned supernovae, comets and asteroids.

The northern hemisphere of Mars is located five to 10 kilometres lower than the Red Planet’s southern hemisphere, a study by a multi-national team…

“We came across this object by chance when, during a search for supernovae, our algorithm pointed out something unusual,” said Dr. Philip Wiseman, one of the authors of the paper published in the journal Monthly Notices of the Royal Astronomical Society.

“Most supernovae and gravitational mass burst events last only a few months before they disappear. That this remains so bright for more than two years seems truly remarkable,” he adds.

The researchers then observed the unusual object with the help of more instruments – these included the Neil Gehrels Swift Space Telescope, the New Technology Telescope in Chile and the Gran Telescopio Canarias in La Palma. Measuring the distance from Earth was made possible by analyzing the spectrum of radiation sent out by the explosion.

“Once you know the distance to the object and its apparent brightness, you can calculate its real light. After doing these calculations, we realized that this object is extremely bright,” says Professor Sebastian Hönig, co-author of the study.

As the scientists explain, the only objects that match the brightness of AT2021lwx are quasars – supermassive black holes with a constant supply of gas absorbed by them, accelerated to gigantic speeds.

“In the case of quasars, we see their brightness increasing and decreasing over time. But when we analyzed data from the last decade, no one detected AT2021lwx. The explosion suddenly appeared with the strength of the brightest objects in the universe. This is unprecedented,” says Prof. Mark Sullivan, one of the scientists.

More accurate data is expected to be provided by studies conducted in other wavelength ranges, including X-rays, which can reveal the temperature and verify the processes underlying the explosion. Scientists are also expected to be helped by new and improved computer simulations. They also hope to discover more similar events.

“With new facilities such as the Vera Rubin Observatory, which is expected to be launched in a few years, we hope to discover more events of this type and learn more about them. It may be that these events, although very rare, are so energetic that they represent key processes that determine how the centers of galaxies change over time,” Dr Wiseman said.

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The body of a Ugandan Olympic athlete who was set on fire by her partner is received by family

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NAIROBI, Kenya (AP) — The body of Ugandan Olympic athlete Rebecca Cheptegei — who died after being set on fire by her partner in Kenya — was received Friday by family and anti-femicide crusaders, ahead of her burial a day later.

Cheptegei’s family met with dozens of activists Friday who had marched to the Moi Teaching and Referral Hospital’s morgue in the western city of Eldoret while chanting anti-femicide slogans.

She is the fourth female athlete to have been killed by her partner in Kenya in yet another case of gender-based violence in recent years.

Viola Cheptoo, the founder of Tirop Angels – an organization that was formed in honor of athlete Agnes Tirop, who was stabbed to death in 2021, said stakeholders need to ensure this is the last death of an athlete due to gender-based violence.

“We are here to say that enough is enough, we are tired of burying our sisters due to GBV,” she said.

It was a somber mood at the morgue as athletes and family members viewed Cheptegei’s body which sustained 80% of burns after she was doused with gasoline by her partner Dickson Ndiema. Ndiema sustained 30% burns on his body and later succumbed.

Ndiema and Cheptegei were said to have quarreled over a piece of land that the athlete bought in Kenya, according to a report filed by the local chief.

Cheptegei competed in the women’s marathon at the Paris Olympics less than a month before the attack. She finished in 44th place.

Cheptegei’s father, Joseph, said that the body will make a brief stop at their home in the Endebess area before proceeding to Bukwo in eastern Uganda for a night vigil and burial on Saturday.

“We are in the final part of giving my daughter the last respect,” a visibly distraught Joseph said.

He told reporters last week that Ndiema was stalking and threatening Cheptegei and the family had informed police.

Kenya’s high rates of violence against women have prompted marches by ordinary citizens in towns and cities this year.

Four in 10 women or an estimated 41% of dating or married Kenyan women have experienced physical or sexual violence perpetrated by their current or most recent partner, according to the Kenya Demographic and Health Survey 2022.

The Canadian Press. All rights reserved.

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The ancient jar smashed by a 4-year-old is back on display at an Israeli museum after repair

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TEL AVIV, Israel (AP) — A rare Bronze-Era jar accidentally smashed by a 4-year-old visiting a museum was back on display Wednesday after restoration experts were able to carefully piece the artifact back together.

Last month, a family from northern Israel was visiting the museum when their youngest son tipped over the jar, which smashed into pieces.

Alex Geller, the boy’s father, said his son — the youngest of three — is exceptionally curious, and that the moment he heard the crash, “please let that not be my child” was the first thought that raced through his head.

The jar has been on display at the Hecht Museum in Haifa for 35 years. It was one of the only containers of its size and from that period still complete when it was discovered.

The Bronze Age jar is one of many artifacts exhibited out in the open, part of the Hecht Museum’s vision of letting visitors explore history without glass barriers, said Inbal Rivlin, the director of the museum, which is associated with Haifa University in northern Israel.

It was likely used to hold wine or oil, and dates back to between 2200 and 1500 B.C.

Rivlin and the museum decided to turn the moment, which captured international attention, into a teaching moment, inviting the Geller family back for a special visit and hands-on activity to illustrate the restoration process.

Rivlin added that the incident provided a welcome distraction from the ongoing war in Gaza. “Well, he’s just a kid. So I think that somehow it touches the heart of the people in Israel and around the world,“ said Rivlin.

Roee Shafir, a restoration expert at the museum, said the repairs would be fairly simple, as the pieces were from a single, complete jar. Archaeologists often face the more daunting task of sifting through piles of shards from multiple objects and trying to piece them together.

Experts used 3D technology, hi-resolution videos, and special glue to painstakingly reconstruct the large jar.

Less than two weeks after it broke, the jar went back on display at the museum. The gluing process left small hairline cracks, and a few pieces are missing, but the jar’s impressive size remains.

The only noticeable difference in the exhibit was a new sign reading “please don’t touch.”

The Canadian Press. All rights reserved.

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B.C. sets up a panel on bear deaths, will review conservation officer training

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VICTORIA – The British Columbia government is partnering with a bear welfare group to reduce the number of bears being euthanized in the province.

Nicholas Scapillati, executive director of Grizzly Bear Foundation, said Monday that it comes after months-long discussions with the province on how to protect bears, with the goal to give the animals a “better and second chance at life in the wild.”

Scapillati said what’s exciting about the project is that the government is open to working with outside experts and the public.

“So, they’ll be working through Indigenous knowledge and scientific understanding, bringing in the latest techniques and training expertise from leading experts,” he said in an interview.

B.C. government data show conservation officers destroyed 603 black bears and 23 grizzly bears in 2023, while 154 black bears were killed by officers in the first six months of this year.

Scapillati said the group will publish a report with recommendations by next spring, while an independent oversight committee will be set up to review all bear encounters with conservation officers to provide advice to the government.

Environment Minister George Heyman said in a statement that they are looking for new ways to ensure conservation officers “have the trust of the communities they serve,” and the panel will make recommendations to enhance officer training and improve policies.

Lesley Fox, with the wildlife protection group The Fur-Bearers, said they’ve been calling for such a committee for decades.

“This move demonstrates the government is listening,” said Fox. “I suspect, because of the impending election, their listening skills are potentially a little sharper than they normally are.”

Fox said the partnership came from “a place of long frustration” as provincial conservation officers kill more than 500 black bears every year on average, and the public is “no longer tolerating this kind of approach.”

“I think that the conservation officer service and the B.C. government are aware they need to change, and certainly the public has been asking for it,” said Fox.

Fox said there’s a lot of optimism about the new partnership, but, as with any government, there will likely be a lot of red tape to get through.

“I think speed is going to be important, whether or not the committee has the ability to make change and make change relatively quickly without having to study an issue to death, ” said Fox.

This report by The Canadian Press was first published Sept. 9, 2024.

The Canadian Press. All rights reserved.

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