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Unravelling the engineering behind the Perseverance landing – McGill Tribune

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On Feb. 18, physicists and engineers marked a new chapter in Martian history: A series of radio signals confirmed the touchdown of NASA’s Perseverance rover. Over seven months, the rover completed a 300 million mile journey to Mars, averaging a speed of about 12,000 miles an hour. 

The Perseverance Rover landed on the Jezero Crater, where it will search for signs of life by collecting samples of Martian soil. 

Montreal-born Dr. Farah Alibay is a NASA systems engineer who is part of the operations team for the Mars 2020 mission. The team was responsible for manufacturing, testing, and landing the Perseverance rover. 

In an interview with The McGill Tribune, Alibay detailed the feats of engineering behind the mission, its main objectives, and how Perseverance differed from previous rovers sent to Mars.

“We think that about two billion years ago, Mars looked like Earth,” Alibay said. “It had an atmosphere, a magnetic field, [and] liquid water [….] About two billion years ago, Earth had microbial life. If there was life on Earth back then and Mars looked like that, there could have been life on Mars too, and that is what we are looking for.”

Perseverance shares many common technical features with its predecessor, Curiosity. Although Perseverance is almost 100 kilograms heavier than Curiosity, it cost almost 300 million dollars less to build. Other paramount differences between the two rovers include an upgrade in the number and quality of cameras on Perseverance. 

“Perseverance has an additional computer onboard and that is the Vision Compute Element, which allowed us to land on the Jezero Crater,” Alibay said. “The computer was taking images as we were landing, comparing them to a map, [and] allowing the rover to make decisions on board on how to divert the rover and to land.” 

Engineers at NASA’s Jet Propulsion Laboratory (JPL) also implemented a thicker aluminum wheel with a greater diameter, but a narrower width, allowing Perseverance to overcome the sharp Martian terrain. 

Perseverance is equipped with six more cameras than Curiosity and was designed to collect rock samples in a different manner. 

“Perseverance has a robotic arm that contains a set of instruments located on its end,” Alibay said. “One of which is a coring drill that will drill out a sample and transfer it to the Sample Caching System. Another robotic arm then inserts the samples into tubes and seals them.” 

One of the main goals of the mission is to test out a new technology: The Mars Oxygen ISRU Experiment (MOXIE). 

MOXIE aims to take in Martian air rich in carbon dioxide and pass it through a series of pumps that carries the gas to an electrode that extracts the oxygen. 

“If we are ever to send astronauts to Mars, then they are going to need oxygen,” Alibay said. “Not just to breathe, but as a rocket fuel to bring them back home.”

Aboard Perseverance is Ingenuity, a four-pound helicopter set to carry out the first controlled flight mission on another planet. The 0.49 metre-tall helicopter is powered by solar energy and will have to overcome a plethora of obstacles, like low atmospheric pressure and rocky Martian terrain, to carry out a successful flight. 

“If you are having only one per cent of atmosphere then you are not getting as much lift, so we had to come up with a system that is both really light but also rugged to survive the Martian environment,” Alibay said. “We are currently looking for a site to drop off the helicopter and once we have done that, we will drop it off, do the initial commissioning and then fly it. I am hopeful that will happen within the next couple of months.”

It has been decades since humans last set foot on a celestial body. Without a doubt, the Mars 2020 mission brings us one trip closer to a human mission to the red planet.

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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.

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