adplus-dvertising
Connect with us

Science

Volunteers build flying telescope to see total eclipse above the clouds – Vernon Morning Star

Published

 on


Early next month, millions of Canadians will gaze skyward to witness a total solar eclipse. But some stand to be disappointed as clouds get in the way.

David Hunter plans to have an unobstructed view, and he’s inviting others to join him. The retired medical physicist in western New Brunswick has led a group of volunteers to build a sun-tracking telescope that will be hoisted aloft by a weather balloon on the afternoon of April 8.

“The primary goal is to get over any existing cloud cover,” Hunter said in an interview, adding that the helium-filled balloon could rise as high as 30 kilometres above the Earth after its launch from Florenceville-Bristol, N.B., at 3:30 p.m. Atlantic daylight time.

As it ascends, the balloon will be carrying a 2.3-metre tube-shaped box equipped with tiny computers, four tracking devices and several cameras, some of which will be transmitting images to a ground station at the Florenceville Inn.

From there, the video will be livestreamed to several viewing locations in western New Brunswick, as well as a YouTube channel, the link for which will soon be posted on Hunter’s website.

The moon’s 185-kilometre-wide shadow will enter Florenceville-Bristol at 4:32 p.m. ADT, plunging the surrounding area into darkness for more than three minutes. Only then will it be possible to safely look at the sun without eye protection.

Assuming there is little cloud cover, the sun’s rays will disappear into twilight, glimmering stars and planets will appear and the horizon will glow orange like at sunset. At that point, the sun’s wispy corona will fan out from behind a black moon, an ethereal sight normally lost in daylight glare.

The temperature will drop about 5 C and nearby animals may act strangely, experts say. And then it will be over, as the moon’s shadow races to the east at about 3,700 kilometres per hour.

Hunter said the biggest technical challenge his team had to overcome was designing a machine to enable the telescope to continuously track the sun as the balloon’s eight-kilogram payload wobbles in the wind.

“It spins, but it also bobs and weaves,” Hunter said, adding that students from the University of New Brunswick also worked on the project. “This has been the most difficult part … I was told it was impossible.”

Using technology developed at Université Laval in Quebec City, Hunter and his team built their own version of a gimbal mechanism known as the “Agile Eye.” Instead of pointing the flying telescope at the sun, it is aimed downward at a mirror attached to two computerized control motors.

“The mirror moves in such a way that it always points the sun into the telescope,” Hunter said.

Experiencing solar eclipses has been a lifelong passion for Hunter. As a boy growing up in Florenceville, he saw his first eclipse in 1963, having read about the solar system and the universe in a series of “How and Why Wonder Books.”

“Seeing the pictures of galaxies and, particularly, the Orion nebula, I thought, ‘Oh my heavens, that’s beautiful.’”

He built a telescope from a kit, and in March 1970 he travelled to Nova Scotia with his family to see a total solar eclipse.

“It was cloudy,” he said with a sigh. “It was such a helpless feeling. That was my first experience with being clouded out on an eclipse.”

As an adult, Hunter worked in Toronto on digital imaging methods for breast cancer screening. But his interest in cosmology never waned. “When I retired, I thought that if I moved back to New Brunswick, there’s open space,” he said. “You can actually see stuff in the sky, which is not so easy in Toronto.”

And when he learned that the 2024 solar eclipse would see the moon’s shadow pass directly over his hometown, he thought, “I don’t want to be clouded out again.”

Meanwhile, the prevailing westerly winds are expected to carry the balloon along the moon’s projected path, but that’s not a sure thing. “We have no directional control over where it is going,” Hunter said. “We’re at the mercy of the winds.”

Still, Hunter said a November test flight went off without a hitch. As the balloon neared the Gulf of St. Lawrence on New Brunswick’s east coast, a signal from the ground station instructed an on-board computer to sever the rope between the balloon and its payload. The payload dropped safely to the ground, a parachute slowing its descent.

Despite their cosmic mystique, total solar eclipses aren’t rare. They appear once or twice every year somewhere on the planet, according to NASA. Most locations typically wait between 400 and 1,000 years for a repeat performance. The last time a total solar eclipse passed through the area now known as central New Brunswick was AD 982, Hunter said.

Nova Scotia, by contrast, has been relatively spoiled, experiencing total solar eclipses in 1970 and again in 1972. And next month’s eclipse will also track across the northern tip of Cape Breton. Since 1963, Canadians have witnessed five total solar eclipses, though the one in 2008 tracked across the upper reaches of the Arctic.

READ ALSO: Where will you be for the April 8 total solar eclipse? There’s still time to grab a spot

— David Hunter’s website is at https://eclipseplus.ca.

Michael MacDonald, The Canadian Press

Adblock test (Why?)

728x90x4

Source link

Continue Reading

News

Here’s how Helene and other storms dumped a whopping 40 trillion gallons of rain on the South

Published

 on

 

More than 40 trillion gallons of rain drenched the Southeast United States in the last week from Hurricane Helene and a run-of-the-mill rainstorm that sloshed in ahead of it — an unheard of amount of water that has stunned experts.

That’s enough to fill the Dallas Cowboys’ stadium 51,000 times, or Lake Tahoe just once. If it was concentrated just on the state of North Carolina that much water would be 3.5 feet deep (more than 1 meter). It’s enough to fill more than 60 million Olympic-size swimming pools.

“That’s an astronomical amount of precipitation,” said Ed Clark, head of the National Oceanic and Atmospheric Administration’s National Water Center in Tuscaloosa, Alabama. “I have not seen something in my 25 years of working at the weather service that is this geographically large of an extent and the sheer volume of water that fell from the sky.”

The flood damage from the rain is apocalyptic, meteorologists said. More than 100 people are dead, according to officials.

Private meteorologist Ryan Maue, a former NOAA chief scientist, calculated the amount of rain, using precipitation measurements made in 2.5-mile-by-2.5 mile grids as measured by satellites and ground observations. He came up with 40 trillion gallons through Sunday for the eastern United States, with 20 trillion gallons of that hitting just Georgia, Tennessee, the Carolinas and Florida from Hurricane Helene.

Clark did the calculations independently and said the 40 trillion gallon figure (151 trillion liters) is about right and, if anything, conservative. Maue said maybe 1 to 2 trillion more gallons of rain had fallen, much if it in Virginia, since his calculations.

Clark, who spends much of his work on issues of shrinking western water supplies, said to put the amount of rain in perspective, it’s more than twice the combined amount of water stored by two key Colorado River basin reservoirs: Lake Powell and Lake Mead.

Several meteorologists said this was a combination of two, maybe three storm systems. Before Helene struck, rain had fallen heavily for days because a low pressure system had “cut off” from the jet stream — which moves weather systems along west to east — and stalled over the Southeast. That funneled plenty of warm water from the Gulf of Mexico. And a storm that fell just short of named status parked along North Carolina’s Atlantic coast, dumping as much as 20 inches of rain, said North Carolina state climatologist Kathie Dello.

Then add Helene, one of the largest storms in the last couple decades and one that held plenty of rain because it was young and moved fast before it hit the Appalachians, said University of Albany hurricane expert Kristen Corbosiero.

“It was not just a perfect storm, but it was a combination of multiple storms that that led to the enormous amount of rain,” Maue said. “That collected at high elevation, we’re talking 3,000 to 6000 feet. And when you drop trillions of gallons on a mountain, that has to go down.”

The fact that these storms hit the mountains made everything worse, and not just because of runoff. The interaction between the mountains and the storm systems wrings more moisture out of the air, Clark, Maue and Corbosiero said.

North Carolina weather officials said their top measurement total was 31.33 inches in the tiny town of Busick. Mount Mitchell also got more than 2 feet of rainfall.

Before 2017’s Hurricane Harvey, “I said to our colleagues, you know, I never thought in my career that we would measure rainfall in feet,” Clark said. “And after Harvey, Florence, the more isolated events in eastern Kentucky, portions of South Dakota. We’re seeing events year in and year out where we are measuring rainfall in feet.”

Storms are getting wetter as the climate change s, said Corbosiero and Dello. A basic law of physics says the air holds nearly 4% more moisture for every degree Fahrenheit warmer (7% for every degree Celsius) and the world has warmed more than 2 degrees (1.2 degrees Celsius) since pre-industrial times.

Corbosiero said meteorologists are vigorously debating how much of Helene is due to worsening climate change and how much is random.

For Dello, the “fingerprints of climate change” were clear.

“We’ve seen tropical storm impacts in western North Carolina. But these storms are wetter and these storms are warmer. And there would have been a time when a tropical storm would have been heading toward North Carolina and would have caused some rain and some damage, but not apocalyptic destruction. ”

___

Follow AP’s climate coverage at https://apnews.com/hub/climate

___

Follow Seth Borenstein on Twitter at @borenbears

___

Associated Press climate and environmental coverage receives support from several private foundations. See more about AP’s climate initiative here. The AP is solely responsible for all content.

Source link

Continue Reading

Science

‘Big Sam’: Paleontologists unearth giant skull of Pachyrhinosaurus in Alberta

Published

 on

 

It’s a dinosaur that roamed Alberta’s badlands more than 70 million years ago, sporting a big, bumpy, bony head the size of a baby elephant.

On Wednesday, paleontologists near Grande Prairie pulled its 272-kilogram skull from the ground.

They call it “Big Sam.”

The adult Pachyrhinosaurus is the second plant-eating dinosaur to be unearthed from a dense bonebed belonging to a herd that died together on the edge of a valley that now sits 450 kilometres northwest of Edmonton.

It didn’t die alone.

“We have hundreds of juvenile bones in the bonebed, so we know that there are many babies and some adults among all of the big adults,” Emily Bamforth, a paleontologist with the nearby Philip J. Currie Dinosaur Museum, said in an interview on the way to the dig site.

She described the horned Pachyrhinosaurus as “the smaller, older cousin of the triceratops.”

“This species of dinosaur is endemic to the Grand Prairie area, so it’s found here and nowhere else in the world. They are … kind of about the size of an Indian elephant and a rhino,” she added.

The head alone, she said, is about the size of a baby elephant.

The discovery was a long time coming.

The bonebed was first discovered by a high school teacher out for a walk about 50 years ago. It took the teacher a decade to get anyone from southern Alberta to come to take a look.

“At the time, sort of in the ’70s and ’80s, paleontology in northern Alberta was virtually unknown,” said Bamforth.

When paleontogists eventually got to the site, Bamforth said, they learned “it’s actually one of the densest dinosaur bonebeds in North America.”

“It contains about 100 to 300 bones per square metre,” she said.

Paleontologists have been at the site sporadically ever since, combing through bones belonging to turtles, dinosaurs and lizards. Sixteen years ago, they discovered a large skull of an approximately 30-year-old Pachyrhinosaurus, which is now at the museum.

About a year ago, they found the second adult: Big Sam.

Bamforth said both dinosaurs are believed to have been the elders in the herd.

“Their distinguishing feature is that, instead of having a horn on their nose like a triceratops, they had this big, bony bump called a boss. And they have big, bony bumps over their eyes as well,” she said.

“It makes them look a little strange. It’s the one dinosaur that if you find it, it’s the only possible thing it can be.”

The genders of the two adults are unknown.

Bamforth said the extraction was difficult because Big Sam was intertwined in a cluster of about 300 other bones.

The skull was found upside down, “as if the animal was lying on its back,” but was well preserved, she said.

She said the excavation process involved putting plaster on the skull and wooden planks around if for stability. From there, it was lifted out — very carefully — with a crane, and was to be shipped on a trolley to the museum for study.

“I have extracted skulls in the past. This is probably the biggest one I’ve ever done though,” said Bamforth.

“It’s pretty exciting.”

This report by The Canadian Press was first published Sept. 25, 2024.

The Canadian Press. All rights reserved.

Source link

Continue Reading

News

The ancient jar smashed by a 4-year-old is back on display at an Israeli museum after repair

Published

 on

 

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.

Source link

Continue Reading

Trending