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Nova Scotia professor studies light at the edge of supermassive black holes – Global News

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HALIFAX – Black holes, the astronomical mysteries at the centre of physics and astronomy, aren’t the cosmic vacuums people think they are.

Their activity is a lot more complicated than that, says Luigi Gallo, professor in the astronomy and physics department at Saint Mary’s University in Halifax.

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“A lot of black holes actually eject a lot of material out into space,” Gallo said in an interview Tuesday.

“This material can then get shot across the galaxy, even into the space between galaxies, and it can kind of affect how galaxies form and how the galaxy evolves sometimes.”

Gallo’s research focuses on supermassive black holes – the regions in space where gravity is so strong that not even light can escape. Supermassive black holes are orders of magnitude larger than our sun.

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He and his students are looking into the area right at the edge of supermassive black holes as well as the high-temperature X-rays that are found there. Beyond that edge – known as the event horizon – scientists aren’t able to see what’s going on because light gets sucked into the black hole’s maw and disappears.

Gallo said by looking at the edges of supermassive black holes – the largest kinds of black holes – he and other scientists are hoping to get a better picture of the shape of the area surrounding the perimeter of those massive voids. They want to know what that area is made of and how it’s falling into the hole.






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X-rays, Gallo said, are made of light the human eye can’t see. And therefore, he said, to study them, scientists are planning to launch a new satellite into space. His research is being used in the development of the satellite, called XRISM. The project is backed by NASA and the Japan Aerospace Exploration Agency, and it is set to be launched into space in 2022.

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The satellite will be equipped with a tool called a calorimeter, which is a sensitive prism that will break the X-rays into a band of colours. From there, researchers will be able to use the different colours to identify the composition of the material and its movement around a black hole, giving them more information about the “geometry” of the region just outside the hole itself, Gallo said.

There is an exchange between the black hole and the outer reaches of the galaxy it’s located in, Gallo said, a sort of “feedback” loop that allows the two to “know” about each other. “We understand that there’s a relationship between how galaxies grow and how black holes at the centre grow, but we don’t really know exactly which one is driving which.”

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He said that as the black hole becomes “active” and spits material out into space, “it can trigger or turn off star formations,” affecting how heavenly bodies in the path of the material evolve. Scientists believe these massive objects exist at the centre of every galaxy.

Though scientists aren’t exactly sure how the relationship between a galaxy’s dark centre and its outermost reaches works, Gallo said the new satellite can hopefully help explain.

“The galaxy dumps material onto the black hole and then at some point the black hole says, `That’s enough material, I don’t want any more,’ and it tosses it back out into the galaxy and it turns things off and stops the feeding process,” he said.

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“Eventually it stops tossing material out and the galaxy starts feeding it again and you get this cyclic process.”

This report by The Canadian Press was first published Jan. 13, 2021.

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This story was produced with the financial assistance of the Facebook and Canadian Press News Fellowship.

© 2021 The Canadian Press

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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.

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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.”

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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.

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