Traces of a rare molecule known as phosphine have been found in the hellish, heavily acidic atmosphere of Venus, astronomers announced Monday — providing a tantalizing clue about the possibility of life. Phosphine molecules found on Earth are primarily a result of human industry or the actions of microbes that thrive in oxygen-free environments.
The researchers are not claiming life has been detected on the
second planet from the sun. But the observations suggest at least the
possibility of microbial activity in the upper layers of Venus’ atmosphere,
well away from the planet’s inhospitable surface.
“We have detected a rare gas called phosphine in
the atmosphere of our neighbor planet Venus,” said Jane Greaves, a
professor at Cardiff University in the United Kingdom and lead author of a
report published in Nature Astronomy. “And the reason for our
excitement is that phosphine gas on Earth is made by microorganisms that live
in oxygen-free environments. And so there is a chance that we have detected
some kind of living organism in the clouds of Venus.”
Even so, the team said, much more study is needed to support any
such claim, extraordinary as it would be.
“In order to make this quite extraordinary claim that there
might be life there, we really have to rule everything out, and that’s why
we’re very cautious saying we’re not claiming there’s life, but claiming
there’s something that is really unknown and it might be life,” said team
member William Bains, a researcher at MIT.
Sara Seager, a fellow MIT scientist who studies exoplanet
atmospheres, agreed, saying “we are not claiming we have found life on
Venus.”
“We are claiming the confident detection of phosphine gas whose
existence is a mystery,” she said. “Phosphine can be produced by some
(non-biological) processes on Venus, but only in such incredibly tiny amounts
it’s not enough to explain our observation. So we’re left with this other
exciting, enticing possibility: that perhaps there is some kind of life in
Venus’ clouds.”
Mars has long been considered the best candidate in
the solar system beyond Earth to have hosted microbial life in the distant past
or even in the present, as suggested by background levels of methane. NASA, the
European Space Agency, China, India, Russia and United Arab Emirates are all
pursuing exploration of the red planet in one form or another.
NASA also is planning a flagship mission to study the moons of Jupiter. Scientists believe one of the
planet’s largest and best-known moons, Europa, heated by tidal stresses and
gravitational interactions with other moons, harbors a salty, possibly
habitable ocean beneath its icy crust. Other frozen moons in the outer solar
system, possible “water worlds,” are also candidates for study.
But Venus is the victim of a runaway greenhouse effect in which
thick clouds in a mostly carbon dioxide atmosphere trap sunlight, producing
temperatures at the surface that soar to nearly 900 degrees, hot enough to melt
lead.
In the planet’s upper atmosphere, however, temperatures are much
more hospitable. Despite the acidic nature of the clouds, scientists have
speculated it may be possible for alien microbes to exist.
“The surface conditions there today are really hostile, the
temperature is enough to melt our landers,” Greaves said. “But it’s
thought that much earlier in Venus’ history the surface was much cooler and
wetter and life possibly could have originated.
“There is a long-standing theory that some of the smallest
forms of life might have been able to evolve upwards into the high clouds.
Conditions there are certainly not nice, they’re extremely acidic and it’s very
windy, but on the other hand, if you’re talking about 50 to 60 kilometers up,
then the pressure is much like it is on the surface of the Earth and the
temperature’s quite nice, maybe up to about 85 degrees Fahrenheit. So it’s been
hypothesized that this is a living habitat today.”
Greaves’ team studied spectra of Venus’ atmosphere using the James
Clerk Maxwell Telescope in Hawaii and 45 radio telescope antennas in the
Atacama Large Millimeter/submillimeter Array in Chile and were surprised to see
unmistakable signs of phosphine. “It was a shock,” Greaves said.
The detection was rewarded with additional observing time on the
ALMA array and “in the end, we found that both observatories had seen the
same thing, faint absorption at the right wavelength to be phosphine gas, where
the molecules are backlit by the warmer clouds below,” Greaves said in a
statement.
Only trace amounts were observed, about 20 molecules per billion.
But additional research showed natural sources of phosphine — volcanoes,
lightning, minerals blown up into the atmosphere, the action of sunlight —
would only generate one ten thousandth the amount actually detected.
The team can rule out many non-biological ways to generate the
observed levels of phosphine, but that doesn’t mean life is the only
explanation. The atmosphere of Venus is 90% sulfuric acid, raising “many
questions, such as how any organisms could survive,” said MIT researcher
Cara Sousa Silva.
“On Earth, some microbes can cope with up to about 5% of acid
in their environment, but the clouds of Venus are almost entirely made of
acid,” she said.
Greaves’ team is awaiting additional telescope time to look for
signs of other gases associated with biological activity and to determine the
temperature of the clouds where the phosphine is present to gain additional
insights. Ultimately, future visits by spacecraft likely will be needed to
fully resolve the question.
“There can always be something we overlooked,” said Seager. “Ultimately, the only thing that will answer this question for us — is there life, is there not life — is actually going to Venus and making more detailed measurements for signs of life and maybe life itself.”
banner image: A false-colour image of Venus as captured by the Ultraviolet Imager aboard Japan’s Venus Climate Orbiter (Akatsuiki). JAXA
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.
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.
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.”
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.
