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A Green Glow Has Been Detected in the Martian Atmosphere – Gizmodo

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Artist’s impression of ESA’s ExoMars Trace Gas Orbiter detecting the green glow of oxygen in the martian atmosphere.
Image: ESA

The Red Planet has a touch of green, according to atmospheric observations performed by the ExoMars Trace Gas Orbiter. It’s the first time this effect has been documented on a planet other than Earth.

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Like Earth, Mars features green airglow emissions in its dayside atmosphere, according to new research published in Nature Astronomy. The green hue happens when the Sun’s rays excite oxygen molecules in the upper atmosphere.

This green glow effect is quite faint, but astronauts aboard the International Space Station have the best seats in the house to view the phenomenon happening on Earth. They can spot airglow when looking at Earth’s limb—the curved edge of the planet as it appears to intersect with space.

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Green airglow in Earth’s atmosphere, as seen from the ISS in 2011.

Green airglow in Earth’s atmosphere, as seen from the ISS in 2011.
Image: NASA

Airglow green line emissions are not to be confused with auroras, commonly known as the Northern and Southern Lights. Auroras arise from collisions between atmospheric molecules, namely oxygen and nitrogen, and fast-moving particles, i.e. electrons, that originate in Earth’s magnetic field. Green line emissions also involve oxygen atoms, which produce the green hue, but the dayglow happens when the Sun’s rays directly excite these atoms and molecules (Mars lacks a strong magnetic field). Nightglow emissions happen when busted molecules recombine.

And yes, Mars has oxygen, though not at the same levels seen on Earth. In fact, atmospheric oxygen on Mars exists as a byproduct of disintegrating carbon dioxide, the result of the Sun’s rays knocking out one of its two oxygen atoms. It’s this very process that produces the green glow, according to the new research, led by Jean-Claude Gérard of the University of Liège in Belgium.

Green airglow emissions on Mars were predicted to exist 40 years ago, but this is the first confirmed detection—a result made possible by the ExoMars Trace Gas Orbiter, a satellite that’s been circling Mars since 2016. The orbiter detected the excited oxygen with its NOMAD spectrometer, which scanned the Martian dayside surface in both ultraviolet and visible light.

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“Previous observations hadn’t captured any kind of green glow at Mars, so we decided to reorient the [ultraviolet and visible spectrometer]… to point at the ‘edge’ of Mars, similar to the perspective you see in images of Earth taken from the ISS,” explained Ann Carine Vandaele from the the Royal Belgian Institute for Space Aeronomy in an ESA press release.

The researchers took measurements between 12 to 250 miles (20 to 400 km) above the Martian surface. The green oxygen emissions were found in all of these altitudes, but they were strongest at 50 miles (80 km) above the surface. The strength varied according to the changing distance between Mars and the Sun.

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Interestingly, this technique can now be used to measure the density of the Martian atmosphere. This could prove useful for upcoming missions in which engineers need to account for the atmospheric drag experienced by orbiting satellites and by parachutes delivering probes to the surface.

Earth and Venus, as seen from the surface of Mars.

Earth and Venus, as seen from the surface of Mars.
Image: NASA/JPL-Caltech

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In other Mars-related news, NASA’s Curiosity rover captured a shot of Earth and Venus in the Martian night sky. Both planets appear as bright specks of light, with the third planet from the Sun glowing more brightly than the second, as seen from the fourth planet. The image was captured on June 5, 2020 as Curiosity was measuring the brightness of twilight.

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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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