NASA’s Curiosity Is Likely Detecting Methane From Mars’ Deep Subsurface After All - Forbes | Canada News Media
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NASA’s Curiosity Is Likely Detecting Methane From Mars’ Deep Subsurface After All – Forbes

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For the past two decades, planetary scientists have been trying to solve the mystery surrounding measurements of atmospheric methane on Mars. This includes repeated detections of this potential biosignature right above the surface of Mars’ Gale Crater by NASA’s Curiosity rover.

But as yet, the European Space Agency’S (ESA) ExoMars Trace Gas Orbiter (TGO) has come up empty when looking for methane higher in the Martian atmosphere, says NASA.

“When the Trace Gas Orbiter came on board in 2016, I was fully expecting the orbiter team to report that there’s a small amount of methane everywhere on Mars,” Chris Webster, lead of the Tunable Laser Spectrometer (TLS) instrument in the Sample Analysis at Mars (SAM) chemistry lab aboard the Curiosity rover, said in a statement.

But now NASA thinks it may have found a solution. 

Because it needs a lot of power, TLS operates mostly at night when no other Curiosity instruments are working, says NASA. That’s when the Martian atmosphere is calm at night and methane seeping from the ground builds up near the surface where Curiosity can detect it, the agency notes.  

ESA’S Trace Gas Orbiter, on the other hand, requires sunlight to pinpoint methane about 3 miles above the surface.

So, NASA made specific measurements using the TLS instrument during daytime and also confirmed a non-detection of the methane gas. Webster and colleagues detailed their results this week in The Astronomy and Astrophysics Journal. 

Over the past two decades, the authors point out, Mars measurements from a wide variety of platforms (ground-based telescopes, orbiters, and rover) have reported methane values from zero to some 45 parts per billion by volume.

We report that the very low methane levels measured at night —- possibly from a subsurface seep —- are dissipated and dispersed when the sun comes up, Paul Mahaffy, the principal investigator of SAM, who’s based at NASA’s Goddard Space Flight Center in Greenbelt, Maryland, told me.  Our daytime measurements also give a null detection just like those from ESA’s orbiting TGO spacecraft, he says.

As for the methane measured in Gale Crater, the site which Curiosity has been exploring for nearly the past decade?

“With no evidence for methane production by the rover itself, we propose that the source is one of planetary micro-seepage,” the authors write.

Methane seepage from Gale Crater might possibly be from present or past microbial life of the variety that produces methane (methanogens) on Earth, says Mahaffy.  But he says it’s equally plausible that this methane could be from past subsurface abiotic water rock interactions that also produced methane.

If the methane we measure comes from a methane seep in Gale Crater, Mahaffy expects that this would also be happening in many places on mars since, there are many similar deep craters on Mars.

Methane is a stable molecule that is expected to last on Mars for about 300 years before getting torn apart by solar radiation, says NASA.  The agency notes that experiments are underway to test whether very low-level electric discharges induced by dust in the Martian atmosphere could destroy methane, or whether abundant oxygen at the Martian surface quickly destroys methane before it can reach the upper atmosphere. 

Since we have seen occasional large spikes of methane orders of magnitude more intense than most of our measurements, I would encourage our European colleagues to just keep looking out for this signal as they orbit Mars, says Mahaffy. Methane release from the subsurface may be episodic and a sudden big burp may enable a TGO detection of this transient signal, he says.

Such methane detections are too important to do otherwise since most of the methane in earth’s atmosphere originates from microbial activity.

“But Earth teaches us that there are multiple pathways by which methane can be produced in the complete absence of biology,” Timothy Lyons, a distinguished professor of biogeochemistry at the University of California, Riverside, who was not a part of the team, told me. “We simply don’t yet know which is the case for the methane on Mars.”

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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.”

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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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