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What’s next for Europe’s JUICE mission? Here’s what to expect on its long journey to Jupiter

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The European Space Agency’s (ESA) flagship mission to Jupiter and its icy moons is underway.

But after the successful launch of the JUICE (Jupiter Icy Moons Explorer) spacecraft, what’s next for the 1.6 billion euro ($1.77 billion) mission to Jupiter?

After blasting off into the sky above Europe’s spaceport in French Guiana, JUICE now embarks on an eight-year journey that will see it perform fly-bys of Venus and Earth to gain gravity assists that will accelerate it to an encounter with Jupiter in 2031.

But the long journey does not mean that mission scientists will get to put their feet up for eight years. In fact, their work is just beginning.

“It would be nice to forget about it for eight years, but we’ll be kept pretty busy planning and replanning,” said Randy Gladstone, of the South-west Research Institute in San Antonio, Texas, in an interview with Space.com. Gladstone is the Principal Investigator on JUICE’s Ultraviolet Spectrograph (UVS), which is one of NASA’s contributions to the JUICE project.

JUICE will return to Earth in August 2024 for a fly-by and gravity assist that will then send it in-system to a rendezvous and another gravity assist at Venus in August 2025. Two more gravity assists with Earth will take place in September 2026 and January 2029, the latter one taking advantage of the dance of the planets and sending JUICE on its way at high speed towards Jupiter.

While all this is happening, mission scientists have to learn about how the spacecraft and their instruments work. Although the instruments have been checked out in the laboratories where they were built on Earth, their performance for real in space can create complications.

Learning how the instruments work will be “the first thing to do,” said Gladstone. On the spacecraft, the various instruments may begin to impact each other. For example, one instrument next to another might warm up more than its neighbor prefers, affecting the other instruments’ functionality, while in the micro-gravity of space the whole spacecraft relaxes leading to small changes in alignment.

To calibrate everything, the instrument teams will use carefully chosen target stars that have very stable and well-known properties. In particular, Gladstone’s team will compare the known spectra of the stars with what UVS observes, proceeding to fine-tune the instrument until the observations match the spectra on file.

Some of the calibration of the various instruments will also take place during the fly-bys of Earth and Venus, although testing is limited within two astronomical units of the sun (twice the distance of Earth from the sun, a little bit beyond Mars‘ orbit). While in the inner solar system, JUICE will shield its instruments from the sun by using its antenna dish like a parasol. Were the instruments exposed to the bright sun by accident, they could be damaged beyond repair, and so pointing the instruments while close to the sun is prohibited.

“At Venus [the sun] is too hot for us to even operate, but the Earth fly-bys later will be very valuable for calibration and getting ready for Jupiter,” said Gladstone.

After its final fly-by of Earth, JUICE will be slingshot on a trajectory towards Jupiter. By this time it will have been overtaken by NASA’s Europa Clipper mission, which launches in October 2024 and arrives at Jupiter in April 2030, one year ahead of JUICE.

JUICE won’t simply be a bystander while Europa Clipper is in action at Jupiter, where it will possibly join NASA’s Juno spacecraft that has been in orbit around Jupiter since 2016, assuming it is still functioning. JUICE will be able to provide early warning for both Europa Clipper and Juno if there is a powerful and potentially harmful solar flare directed at Jupiter.

A year before Jupiter orbit insertion (JOI), “we’ll ramp up the team to start making observations,” said Gladstone. “They won’t all be of Jupiter, but they’ll be similar to what we will be doing at Jupiter, so we’ll spend a lot of time practicing with the instruments, and planning. There’s a lot of stuff we can do, but the planning is the big thing.”

Coordinating which instruments will be doing what and when during the 35 fly-bys of three of Jupiter’s moons (two fly-bys of Europa, 12 of Ganymede and 21 of Callisto) will require much negotiation between the various instrument teams as well as those responsible for the spacecraft’s fuel and power supplies.

“We’re all pretty agreeable, but it’s still a lot of work to sort out what we’re going to do second-by-second for the five years that we’re there at Jupiter,” said Gladstone. “But we’ll figure out the best way to get the best science for each fly-by.”

From Gladstone’s point of view, the UVS is concerned with mapping ultraviolet emissions. It does this by passing ultraviolet light through a slit, after which it hits a diffraction grating that spreads out the light into its various ultraviolet wavelengths — a spectrum.

“Most matter interacts really strongly with ultraviolet light, and [UVS] is very sensitive to tiny amounts of gases, which is sort of what Jupiter’s moons have for atmospheres,” said Gladstone.

These tenuous atmospheres — referred to as ‘exospheres’ — cling to the moons, sputtered off their surface by micrometeorite impacts. They can be observed either directly through their ultraviolet emissions when atoms and molecules are excited by collisions with charged particles that fizz around Jupiter’s powerful magnetosphere, or indirectly by watching a moon’s exosphere absorb some of the light of a star or the sun during an occultation. The wavelength absorbed gives away the identity of the atom or molecule doing the absorbing.

Meanwhile, ultraviolet sunlight reflected by the moons can give away details about their surfaces.

“UVS will tell us a lot about the surface composition and structure,” said Gladstone. “We know the surfaces are icy, but there’s a lot of other materials down there besides the ice.”

UVS will also be able to study the ultraviolet auroras that flicker around the magnetic poles of Jupiter. These auroras have previously been observed by the Hubble Space Telescope, the James Webb Space Telescope and by Juno. However, Hubble and James Webb cannot keep a constant eye on the auroras, and Juno spins on its axis to maintain its stability, meaning that its instruments cannot linger on the auroras long enough to see the fainter ones.

“With JUICE we’ll be able to look at those fainter auroras too,” said Gladstone.

 

The planning and practicing that will take place over the next eight years will set the stage for the epic of discovery that will follow, as JUICE provides an unprecedented tour of the Jovian system. Gladstone can’t wait to get started.

“There’s a lot of great stuff to learn,” he said. “With all the variety JUICE is going to see and do, it’s going to be exciting once it gets there.”

 

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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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