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The people replicating Moon dust

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With humanity looking to set foot on the Moon again for the first time in 50 years, space agencies around the world need lunar soil – lots of it.

Even with the walls of a volcanic crater looming behind the white-washed single-storey buildings, it would be easy to miss the sleepy town of Tao. It only takes a few moments to pass through it as you drive along the LZ-20 highway that cuts across the middle of Lanzarote, in the Canary Islands. And despite its vicinity to the Tamia volcanic crater at the heart of the island, Tao is not one of Lanzarote’s key tourist attractions.

Recently, however, the town has been receiving visitors of a very different kind – those whose interest lies not in the volcano, but in the dark grey soil that Tao is built upon. This drab, rocky material has a surprising part to play in one of this decade’s most ambitious human endeavours. It will help put humans back on the Moon.

A team of Spanish scientists have found that the basalt at a quarry near Tao bears a striking similarity to the samples of lunar regolith – the blanket of dusty and rocky debris covering the Moon’s surface – brought back to Earth by the crew of Apollo 14 in 1971. They have used it to create a sample of lunar regolith simulant that can be used to test hardware and experiments before they are sent to the Moon.

The soil sample, called LZS-1, is the latest in a list of lunar regolith simulants of varying quality that have been developed to help Nasa and other space agencies around the world prepare for missions to the Moon.

Among the first lunar simulants to be developed was Minnesota Lunar Simulant 1 (MLS-1) at the University of Minnesota in 1988 from basalt found at an abandoned quarry in Duluth, Minnesota. Researchers discovered the rocks resembled the chemical composition of soil collected from corner of the Sea of Tranquillity visited by the Apollo 11 astronauts. The dark Mare regions, or “seas”, of the Moon are composed largely of basalt rich in magnesium and iron while the lighter, highland areas are made of rocks composed mostly of calcium and aluminium.

The six Apollo missions that landed on the moon between 1969 to 1972 brought back around 380kg (837lbs) of lunar soil and rocks with them to Earth. These samples were zealously protected due to their limited availability.

“It was precious and used only for important scientific research,” says John Gruener, a space scientist at the astromaterials research and exploration science division at Nasa’s Johnson Space Center in Houston, Texas. Yet engineers, biologists, botanists and other research teams working on projects related to the Moon need something to test their equipment and experiments on. They require substances that replicate the physical, chemical and mineral properties of the lunar regolith, not only to see how hardware such as spacecraft and spacesuits might cope with the Moon’s environment, but to test whether it might be possible to eventually grow food in the lunar soil, or use it to make building materials for constructing future lunar bases.

Relatively small amounts of lunar soil were collected by the astronauts of the Apollo missions and returned to Earth, so access to it is highly restricted (Credit: Nasa)

According to Gruener, the first real demand for lunar simulants arose after President George HW Bush’s 1989 announcement of the Space Exploration Initiative (SEI), whose objective was to send humans back to the Moon and then to Mars.

The lunar dust problem

Among the challenges astronauts will face when they return to the Moon is reducing the amount of sharp dust grains that stick to their spacesuits and equipment. The tiny shards of lunar dust carry a tiny electrostatic charge, which makes them particularly clingy. Unfortunately, the dust can damage delicate equipment and electronics, so Nasa’s engineers are developing new coatings they hope can prevent the lunar dust from building up on spacecraft and spacesuits, which they can then test with soil simulants.

“Unlike the Apollo missions, the SEI envisaged a longer stay on the Moon which would require new habitats, rovers and power supplies among other things,” says Gruener. “We would have loved to test the new hardware on the Apollo soil and rock samples. But there was too little of it.”

SEI’s ambitious goals necessitated extensive testing of hardware on Earth for which large quantities of lunar soil was required. With supplies of genuine lunar soil being so limited, the only solution was to develop lunar simulants on Earth. This resulted in the birth of JSC-1, a pioneering lunar regolith simulant developed at the Johnson Space Center in the mid-1990s.

Sourced from the glass-rich basaltic ash from near the volcanic vents on the south flank of the Merriam Crater near Flagstaff in Arizona, JSC-1 was found to be similar to the samples brought back from the Moon by the Apollo 14 mission.

“It had the right mineralogy,” says Gruener. “It had the correct particle size distribution. The individual particles had the right shape and crucially, the simulant had both the crystalline and glass component.”

Lunar soil has a significant glass component because of the large number of high-energy meteorite impacts on its surface. The heat generated from these impacts produces glass in the lunar soil. On Earth, the main places where the soil naturally contains glass is near volcanoes. The Johnson Space Center produced around 20 tonnes (44,092lbs) of JSC-1. However, the SEI programme was later cancelled and consequently the demand for lunar simulants dwindled.

It wasn’t until 2005, when President George W Bush made a speech similar to his father’s by announcing the Vision for Space Exploration (VSE), whose objective was to return to the Moon and would serve as a proving ground for future missions to Mars.

Following this announcement there was renewed interest in lunar soil simulants, resulting in a series of lunar highlands soil simulants called NU-LHT which were made from anorthosite and norite rocks sourced from the Stillwater mine in Montana. However, a similar fate awaited VSE as it was shelved in 2010.

But with the birth of the Artemis programme in 2017, interest in lunar simulants has yet again been rekindled, and there is demand for a more diverse selection of lunar soil simulants to better reflect the soils astronauts might encounter at the Moon’s south pole.

This time, private players are at the forefront of producing simulants. One of the world’s largest producers is the Florida-based Exolith Lab which, since its founding in 2017, has produced 80 tonnes (176,370lbs) of lunar and Martian soil simulants.

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According to Gruener, the moon has a gritty, dusty environment. “For anything mechanical that rolls on or digs into the lunar surface, it has to encounter the regolith which is very different from anything on Earth,” he says. “We [on Earth] have a lot of weathering due to wind and water which tends to round the soil particles. However, on the Moon, there is none of that. The only physical weathering is through impacts, which creates angular soil particles. As a result, things that work on Earth may not work that well on the Moon.”

The regolith simulants are being used for a wide range of tests and experiments. The Johnson Space Center uses them for testing geological tools that will be driven into the rocks on the Moon, for testing the resistance of spacesuit fabrics and for developing air-purifying filters to help prevent lunar dust from contaminating the air in spacecraft and habitats.

Lunar dust has some very specific qualities that are difficult to find on Earth, so volcanic powders and rock samples that come close are highly prized (Credit: ESA)

Lunar dust has some very specific qualities that are difficult to find on Earth, so volcanic powders and rock samples that come close are highly prized (Credit: ESA)

Tonnes of lunar simulant developed by Exolith Lab will be used to test the hardware of Nasa’s Viper rover, which will prospect for water on the lunar south pole. According to Exolith Lab founder Daniel Britt, simulants are also used for experiments on extracting resources like oxygen and metals.

This could be vital as space agencies look to establish a permanent settlement on the Moon – lifting raw materials from the surface of the Earth in rockets is an expensive and energy intensive business, so wherever possible, it will be important to exploit resources already to be found on the lunar surface.

So much lunar simulant might be needed as humans prepare to return to the Moon that the European Space Agency is planning to produce 900 tonnes (1.98 million lbs) of its own lunar regolith simulant, EAC-1. Most of it will be used to help train astronauts for walking on the lunar surface and put lunar rovers through their paces.

How to make a lunar soil

Rock samples, once collected, need to be milled and ground in such a way that will create angular particles. It is also important to produce the correct range of particle sizes. Usually, they do this by passing the crushed rocks through sieves with specific hole sizes.

Jesus Martinez-Frias, a planetary geologist at the Instituto de Geociencias in Madrid, who is part of the team of scientists that developed LZS-1 from the Tao quarry rocks, says they don’t intend to produce quite as much of their new simulant.

“As of now, we have produced two kilograms,” he says. “Our goal is to prepare high-quality material for specific research.” Among the things he says it could be used for is developing ways of extracting oxygen from the lunar soil, growing crops and building structures.

While the simulants and their applications vary, there are some common guiding principles to produce them. According to Britt, the key part is to get the input materials right.

“Some of it is easy, while some like anorthosite are relatively uncommon,” he says.

But Gruener says it is impossible to recreate a regolith simulant that matches 100% with the lunar soil. “We can’t even recreate it at the 80% level.”

According to Cowley, a simulant can’t be a perfect match to the lunar soil because of the properties inherent to Earth. “For example, you will find the hydrological aspect even in rocks emerging from volcanic eruptions, such as higher sodium content compared to the lunar soil.”

But if you do find a good simulant, it can be worth it. The closest matches range in price from $45 (£36) to $150 (£120) per kg (2.2lbs). Not bad for a handful of soil.

 

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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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