Couple randomly attacked, 1 stabbed, by group of teens in Toronto, police say
A man has been transported to hospital after police say he was stabbed in a random attack carried out by a group of teens in Toronto on Friday night.
In the search for life beyond Earth, NASA's Curiosity rover has been on a nearly decade-long mission to determine if Mars was ever habitable for living organisms.
A new analysis of sediment samples collected by the rover revealed the presence of carbon -- and the possible existence of ancient life on the red planet is just one potential explanation for why it may be there.
Carbon is the foundation for all of life on Earth, and the carbon cycle is the natural process of recycling carbon atoms. On our home planet, carbon atoms go through a cycle as they travel from the atmosphere to the ground and back to the atmosphere. Most of our carbon is in rocks and sediment and the rest is in the global ocean, atmosphere and organisms, according to NOAA, or the National Oceanic and Atmospheric Administration.
That's why carbon atoms -- with their cycle of recycling -- are tracers of biological activity on Earth. So they could be used to help researchers determine if life existed on ancient Mars.
When these atoms are measured inside another substance, like Martian sediment, they can shed light on a planet's carbon cycle, no matter when it occurred.
Learning more about the origin of this newly detected Martian carbon could also reveal the process of carbon cycling on Mars.
A study detailing these findings published Monday in the journal Proceedings of the National Academy of Sciences.
Curiosity landed in Gale Crater on Mars in August 2012. The 154.5-kilometre crater, named for Australian astronomer Walter F. Gale, was probably formed by a meteor impact between 3.5 billion and 3.8 billion years ago. The large cavity likely once held a lake, and now it includes a mountain called Mount Sharp. The crater also includes layers of exposed ancient rock.
For a closer look, the rover drilled to collect samples of sediment across the crater between August 2012 and July 2021. Curiosity then heated these 24 powder samples to around 1,562 degrees Fahrenheit (850 degrees Celsius) in order to separate elements. This caused the samples to release methane, which was then analyzed by another instrument in the rover's arsenal to show the presence of stable carbon isotopes, or carbon atoms.
Some of the samples were depleted in carbon while others were enriched. Carbon has two stable isotopes, measured as either carbon 12 or carbon 13.
"The samples extremely depleted in carbon 13 are a little like samples from Australia taken from sediment that was 2.7 billion years old," said Christopher H. House, lead study author and professor of geosciences at Pennsylvania State University, in a statement.
"Those samples were caused by biological activity when methane was consumed by ancient microbial mats, but we can't necessarily say that on Mars because it's a planet that may have formed out of different materials and processes than Earth."
In lakes on Earth, microbes like to grow in big colonies that essentially form mats just under the surface of the water.
The varied measurements of these carbon atoms could suggest three very different things about ancient Mars. The origin of the carbon is likely due to cosmic dust, ultraviolet degradation of carbon dioxide, or the ultraviolet degradation of biologically produced methane.
"All three of these scenarios are unconventional, unlike processes common on Earth," according to the researchers.
The first scenario involves our entire solar system passing through a galactic dust cloud, something that occurs every 100 million years, according to House. The particle-heavy cloud could trigger cooling events on rocky planets.
"It doesn't deposit a lot of dust," House said. "It is hard to see any of these deposition events in the Earth record."
But it's possible that during an event like this, the cosmic dust cloud would have lowered temperatures on ancient Mars, which may have had liquid water. This could have caused glaciers to form on Mars, leaving a layer of dust on top of the ice. When the ice melted, the layer of sediment including carbon would have remained. While it's entirely possible, there is little evidence for glaciers in Gale Crater and the study authors said it would require further research.
The second scenario involves the conversion of carbon dioxide on Mars into organic compounds, such as formaldehyde, due to ultraviolet radiation. That hypothesis also requires additional research.
The third way this carbon was produced has possible biological roots.
If this kind of depleted carbon measurement was made on Earth, it would show that microbes were consuming biologically produced methane. While Curiosity has previously detected methane on Mars, researchers can only guess if there were once large plumes of methane being released from beneath the surface of Mars. If this was the case and there were microbes on the Martian surface, they would have consumed this methane.
It's also possible that the methane interacted with ultraviolet light, leaving a trace of carbon on the Martian surface.
The Curiosity rover will be returning to the site where it collected the majority of the samples in about a month, which will allow for another chance to analyze sediment from this intriguing location.
"This research accomplished a long-standing goal for Mars exploration," House said. "To measure different carbon isotopes -- one of the most important geology tools -- from sediment on another habitable world, and it does so by looking at nine years of exploration."
A man has been transported to hospital after police say he was stabbed in a random attack carried out by a group of teens in Toronto on Friday night.
Ron Ellis, who played over 1,000 games with the Toronto Maple Leafs and was a member of Canada's team at the 1972 Summit Series, has died at age 79.
The wildfire that sparked Friday and caused evacuation orders for more than 3,000 people in Fort Nelson, B.C., and the nearby Fort Nelson First Nation, has grown to nearly 1,700 hectares in size, according to a Saturday morning update from the BC Wildfire Service.
Hours before the final, Dutch contestant Joost Klein was dramatically booted out by organizers over a backstage incident. He had failed to perform at two dress rehearsals on Friday, and contest organizer the European Broadcasting Union said it was investigating an "incident."
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A growing number of civilians and police officers are demanding the dismissal and arrest of Haiti's police chief as heavily armed gangs launched a new attack in the capital of Port-au-Prince, seizing control of yet another police station early Saturday.
Irresponsibly using a credit card can land you in financial trouble, but personal finance columnist Christopher Liew says when used properly, it can be a powerful wealth-building tool that can help grow your credit profile and create new opportunities.
Where you live plays a big factor in what you pay at the grocery store. And while it's no secret the same item may have a different price depending on the store, city or province, we wanted to see just how big the differences are, and why.
A man who was accused of sexually and physically assaulting a woman had his charges dropped in April, just weeks before he was set to stand trial in Toronto, due to a lack of judges in the region.
A family of fifth generation farmers from Ituna, Sask. are trying to find answers after discovering several strange objects lying on their land.
A Listowel, Ont. man, drafted by the Hamilton Tigercats last week, is also getting looks from the NFL, despite only playing 27 games of football in his life.
The threat of zebra mussels has prompted the federal government to temporarily ban watercraft from a Manitoba lake popular with tourists.
A small Ajax dessert shop that recently received a glowing review from celebrity food critic Keith Lee is being forced to move after a zoning complaint was made following the social media influencer’s visit last month.
The Canada Science and Technology Museum is inviting visitors to explore their poop. A new exhibition opens at the Ottawa museum on Friday called, 'Oh Crap! Rethinking human waste.'
The Regina Police Service says it is the first in Saskatchewan and possibly Canada to implement new technology in its detention facility that will offer real-time monitoring of detainees’ vital health metrics.
Just as she had feared, a restaurant owner from eastern Quebec who visited Montreal had her SUV stolen, but says it was all thanks to the kindness of strangers on the internet — not the police — that she got it back.
The stakes have been set for a bet between Vancouver and Edmonton's mayors on who will win Round 2 of the Stanley Cup playoffs.
A grieving mother is hosting a helmet drive in the hopes of protecting children on Manitoba First Nations from a similar tragedy that killed her daughter.