Recall issued for 38,000 GM vehicles in Canada over software safety glitch
Transport Canada has issued a recall for 38,000 General Motors (GM) vehicles for safety risks related to a software glitch, the agency reported in a notice on Wednesday.
Interplanetary spacecraft have returned hundreds of stunning photographs of Mars' surface over the last 50 years, but not a single sound. That’s all changed thanks to NASA's Perseverance rover.
A new , based on recordings made by its Perseverance rover and published in the journal Nature, has found that the speed of sound is slower on Mars than on Earth, and that the planet is mainly silent.
The research team behind Perseverance's French-U.S. SuperCam2 equipment was persuaded that studying Mars' soundscape may help us better comprehend the planet. So the team in Toulouse, France, designed a microphone dedicated to the exploration of Mars in response to this scientific challenge.
The first sounds from Mars were captured by Perseverance on Feb. 19, 2021, the day after it arrived. Between 20 Hz and 20 kHz, these sounds come inside the human auditory range. They demonstrate that Mars is silent, so quiet that scientists mistook the microphone for broken on multiple occasions.
The study states that apart from the wind, natural sound sources are rare. In addition to this, the scientists investigated the sounds produced by the rover itself, such as shock waves caused by the SuperCam laser's impact on rocks and flights by the Ingenuity helicopter.
They were able to precisely characterize the acoustic features of the Martian atmosphere by investigating the propagation on Mars of these sounds. The behaviour of which is well understood on Earth.
The researchers discovered that the speed of sound on Mars is slower than on Earth: 240 m/s against 340 m/s on our planet. The most striking discovery is that there are two different rates of sound on Mars, one for high-pitched noises and the other for low frequencies.
On Mars, sound attenuation is stronger than on Earth, particularly for high frequencies, which, unlike low frequencies, attenuate rapidly even over short distances, the study states.
All of these elements would make it difficult for two people standing merely five metres apart to be able to have a conversation and hear each other.
The study states that this is caused by the Martian atmosphere's composition (96 per cent CO2, compared to 0.04 per cent on Earth) and the extremely low atmospheric surface pressure (170 times that of Earth).
After a year on the mission, a total of five hours of auditory environment recordings were acquired.
The sound produced by the turbulence of the Martian atmosphere has become perceptible thanks to an in-depth analysis. The study of this turbulence, at scales 1,000 times smaller than anything previously known, might help us better understand how Mars' atmosphere interacts with its surface.
Other robots with microphones might be used in the future to help us better comprehend planetary atmospheres.
Transport Canada has issued a recall for 38,000 General Motors (GM) vehicles for safety risks related to a software glitch, the agency reported in a notice on Wednesday.
About 10 senior Hezbollah commanders were killed along with Ibrahim Aqil, leader of the movement's Radwan special forces unit who was attacked in an Israeli air strike in Beirut on Friday, Israel's military spokesperson said.
An 11-year-old boy died Monday after subway surfing in New York City. He's the fourth person to die from subway surfing in the city this year.
Since she was a young girl growing up in Vancouver, Ginny Lam says her mom Yat Hei Law made it very clear she favoured her son William, because he was her male heir.
Communication breakdowns with local law enforcement hampered the Secret Service's performance ahead of a July assassination attempt on former U.S. president Donald Trump, according to a new report that lays out a litany of missed opportunities to stop a gunman who opened fire from an unsecured roof.
An Ontario man says he’s still waiting for a vehicle he purchased on Kijiji to be delivered to his home. But after more than a month, he says he’s losing hope that the car will arrive and believes that he is a victim of a scam.
An Ontario man says it is 'unfair' to pay a $1,500 insurance surcharge because his four-year-old SUV is at a higher risk of being stolen.
Israel’s military has struck the southern suburbs of Beirut, Lebanon’s capital, in a dramatic escalation in a year-long period of conflict between Israel and Hezbollah.
The province's public security minister said he was "shocked" Thursday amid reports that a body believed to be that of a 14-year-old boy was found this week near a Hells Angels hideout near Quebec City.
They say a dog is a man’s best friend. In the case of Darren Cropper, from Bonfield, Ont., his three-year-old Siberian husky and golden retriever mix named Bear literally saved his life.
A growing group of brides and wedding photographers from across the province say they have been taken for tens of thousands of dollars by a Barrie, Ont. wedding photographer.
Paleontologists from the Royal B.C. Museum have uncovered "a trove of extraordinary fossils" high in the mountains of northern B.C., the museum announced Thursday.
The search for a missing ancient 28-year-old chocolate donkey ended with a tragic discovery Wednesday.
The Royal Canadian Mounted Police is celebrating an important milestone in the organization's history: 50 years since the first women joined the force.
It's been a whirlwind of joyful events for a northern Ontario couple who just welcomed a baby into their family and won the $70 million Lotto Max jackpot last month.
A Good Samaritan in New Brunswick has replaced a man's stolen bottle cart so he can continue to collect cans and bottles in his Moncton neighbourhood.
David Krumholtz, known for roles like Bernard the Elf in The Santa Clause and physicist Isidor Rabi in Oppenheimer, has spent the latter part of his summer filming horror flick Altar in Winnipeg. He says Winnipeg is the most movie-savvy town he's ever been in.
Edmontonians can count themselves lucky to ever see one tiger salamander, let alone the thousands one local woman says recently descended on her childhood home.