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The day the Earth stood still

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Scientific St. Albert
The Gazette is using science to answer questions from students of all ages about the world around them. Send in your questions to [email protected].

Sometimes you just want to stop the world for a bit.

Rodney, a Grade 2 student at Wild Rose Elementary, may have wanted to do so when he asked Scientific St. Albert, “What would happen if the Earth stopped spinning?”

How to stop spinning

To stop the Earth from spinning, we’ll need to counteract the 2 x 10^29 joules of rotational kinetic energy it possesses, Chris Mann, exoplanet scientist at the University of Montreal, said in an email.

“Now that number doesn’t mean much to anybody, but that is about one million times more energy than the asteroid that wiped out the dinosaurs imparted onto the Earth,” he noted.

Mann said chucking the moon or Mars at Earth might do the trick, but that wouldn’t leave us with much of a planet. Alternatively, we could apply a smaller force over a much longer time period, as the moon is doing to Earth now.

“Because our moon raises the tides on Earth — most obviously in the oceans, but a bit even in the rock — it is actually slowing the Earth’s rotation via gravity,” Mann said.

Researchers have determined that this effect has already added about 1.7 milliseconds to the Earth’s day in the last 100 years, said University of Alberta physicist Roger Moore in an email and phone interview. This won’t completely stop the Earth’s spin, but after a few billion years, it will make Earth’s spin equal to its orbital period, meaning one day will last one year. This has already happened to the moon, which is why we always see the same side of it.

You could stop the Earth faster if you took an absurd number of really strong rockets aimed eastward and put them on the end of a really strong tower, Mann said.

“You’d need an insanely tall tower,” he noted, as the rockets would have to be outside Earth’s atmosphere, lest the resulting wind counter their thrust.

Mann said we could also mount a huge, indestructible frictionless gyroscope at the north or south pole and spin it opposite to the Earth’s rotation, which would effectively store the Earth’s angular momentum in the gyroscope. If the gyroscope stored all that momentum, the Earth would stop spinning.

What happens next

What happens next depends on how fast we stop the Earth and how we define “stop” and “Earth.”

“The Earth isn’t a solid object,” Moore noted, and has a liquid outer core and oceans and air sloshing about its surface.

Even if you assume everything from the crust down stops, if you do it suddenly, everything on the surface will still be travelling very, very fast eastward, noted St. Albert amateur astronomer Murray Paulson in a phone and email interview. Around Edmonton, your speed would be about 1,000 km/h.

“It would be really exciting for a few seconds travelling at supersonic speed until you hit something or something hit you, but then you would splatter like a water balloon,” Paulson said.

Paulson said you might survive if you were standing at the North or South Pole when the stop happened, as you wouldn’t have any speed there. Everywhere else would experience supersonic winds and tsunamis that would scour the surface clean.

“It would be a really bad day.”

Once you’ve stopped the Earth, one of two things would happen, depending on how we define “stop.”

Astronomers define days based on the position of stars, Mann said. A solar day happens when the sun returns to the same point in the sky, while a sidereal day happens when the stars return to the same spot.

If we stop the Earth so that the sun stands still, one side would bake in the eternal day while the other would freeze in eternal night, Mann said. Some “tidally locked” planets are already like this.

If we make the stars stand still, an Earth day would become the same as an Earth year, with every location getting six months of light followed by six months of dark, Paulson said.

“We would have a desert planet,” he said, frozen for half the year and roasted for the other half.

A non-spinning Earth would disrupt the lives of plants, bees, and anything used to a day-night cycle, noted Astronomy.com writer Nathaniel Scharping. We wouldn’t get hurricanes, as they need the Earth’s spin to get really powerful, but we would get really long sunsets. If the Earth’s liquid metal core also stops spinning, the planet would likely lose its magnetic field, which would let more cosmic radiation bake the surface.

In any case, the moon would eventually spoil our spin-free future.

“The moon tugging on the Earth would probably start it rotating again after a time,” Paulson said, and eventually the same side of Earth would be facing the moon all the time.

“The moon would become fixed in the sky,” Moore noted, but half the planet would never see it.

If you really want to make the Earth stand still, you’ll probably have to blow up the moon at some point.

 

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

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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. ”

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

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Follow Seth Borenstein on Twitter at @borenbears

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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.

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

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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.

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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.”

The Canadian Press. All rights reserved.

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