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There’s an old joke among astronomy students about a question on the final exam for a cosmology class. It goes like this: “Describe the Universe and give three examples.” Well, a team of researchers in Germany, the U.S., and the UK took a giant leap toward giving at least one accurate example of the Universe.

To do it, they used a set of simulations called “MillenniumTNG”. It traces the buildup of galaxies and cosmic structure across time. It also provides new insight into the standard cosmological model of the Universe. It’s the latest in cosmological simulations, joining such ambitious efforts as the AbacusSummit project of a couple of years ago.

This simulation project takes into account as many aspects of cosmic evolution as possible. It uses simulations of regular (baryonic) matter (which is what we see in the Universe). It also includes dark matter, neutrinos, and the still-mysterious dark energy on the formation mechanisms of the Universe. That’s a tall order.

Simulating the Universe

More than 120,000 computer cores in the SuperMUC-NG in Germany went to work on the data for MillenniumTNG. That tracked the formation of about a hundred million galaxies in an area of space about 2,400 million light-years across. Then the Cosma8 at Durham went to work computing a larger volume of the Universe but filled with a trillion simulated dark matter particles and another 10 billion that tracked the action of massive neutrinos.

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 Projections of gas (top left), dark matter (top right), and stellar light (bottom center) for a slice in the largest hydrodynamical simulation of MillenniumTNG at the present epoch. The slice is about 35 million light-years thick. Courtesy MPA.

The result of this number crunching was a simulated area of the Universe that mirrored the formation and distribution of galaxies. The size was big enough that cosmologists can use it to extrapolate assumptions about the entire Universe and its history. They can also use it to probe for “cracks” in the Standard Cosmological Model of the Universe.

The Cosmological Model and Prediction

Cosmologists have this basic model they propose to explain the evolution of the Universe. It goes like this: The Universe has different types of matter. There’s ordinary baryonic matter, which is what all of us and the stars, planets, and galaxies are made of. It’s just under 5% of the “stuff” of the cosmos. The rest is dark matter and dark energy.

A composite model of matter distribution (with dark matter overlay) in a galaxy formation simulation made by the TNG  Collaboration.
A composite model of matter distribution (with dark matter overlay) in a galaxy formation simulation made by the TNG Collaboration.

The cosmology community calls this strange set of cosmic circumstances the “Lambda Cold Dark Matter” model (LCDM, for short). It actually describes the Universe pretty well. However, there are some discrepancies. Those are what the simulations should help solve. The model is based on data from a huge variety of sources, including cosmic microwave radiation to the “cosmic web”, where galaxies are arranged along an intricate network of dark matter filaments.

What’s still missing is a good understanding of exactly what dark matter is. And, as for dark energy, well, it’s a challenge. And, astrophysicists and cosmologies are looking for a better understanding of LCDM and the existence of the two big unknowns. That requires a lot of sensitive new observations from astronomers. On the other side of the coin, it also needs more detailed predictions for what the LCDM model actually implies. It’s a huge challenge and is what’s driving the big MillenniumTNG simulations. If cosmologists can successfully simulate the Universe then they can use those simulations to help understand what’s happening “in real life.” That
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Moon Dust Could Contaminate Lunar Explorers’ Water Supply

Aldrin bootprint C second impression

Water purification is a big business on Earth. Companies offer everything from desalination to providing just the right pH level for drinking water. But on the Moon, there won’t be a similar technical infrastructure to support the astronauts attempting to make a permanent base there. And there’s one particular material that will make water purification even harder – Moon dust. 

We’ve reported plenty of times about the health problems caused by the lunar regolith, so it seems apparent that you don’t want to drink it. Even more so, the abrasive dust can cause issues with seals, such as those used in electrolyzers to create rocket fuel out of in-situ water resources. It can even adversely affect water purification equipment itself. 

Unfortunately, this contamination is inevitable. Lunar dust is far too adhesive and electrostatically charged to be kept completely separate from the machinery that would recycle or purify the water. So, a group of researchers from DLR in Germany decided to test what would happen if you intentionally dissolved lunar regolith.

Fraser interviews Dr. Kevin Cannon, an expert in lunar dust mitigation.

The short answer is, unsurprisingly, nothing good. Dissolved lunar regolith causes pH, turbidity, and aluminum concentrations all exceed World Health Organization benchmarks for safe drinking water. This happened even with short exposure times (2 minutes) and static pH values, as they used a 5.5 pH buffer in part of the experiments. 

They didn’t use actual lunar dust for these experiments, but a simulant modeled on the regolith returned during the Apollo 16 mission. It mimics the regolith that is thought to be most similar to the Artemis landing sites. In addition to the pH changes and the amount of exposure time (which went up to 72 hours), the authors also varied the amount of dissolved oxygen in the system and the particle size of the simulant.

Those negative results occurred for every test variation, no matter what combination of the four control variables was used. Ultimately, that means engineers will have to devise a system to filter the water from these deposits before it can be recycled into the overall water system.

Aldrin bootprint C second impression 1
After taking the first boot print photo, astronaut Buzz Aldrin moved closer to the little rock and took this second shot. His boot was already completely covered in adhesive dust.
Credit: NASA

The paper explored some potential solutions for that water purification system. Each of the limits that were violated requires its purification methodology. In the author’s estimation, lowering the turbidity is the first requirement. To do so, they suggest doing standard filtration or allowing the dust particles to settle. 

Removing aluminum is next in importance, with another experiment showing that plants that grew in lunar soil showed signs of aluminum toxicity. Additional ions, including calcium, iron, and manganese, also need to be removed, as they were above acceptable levels in some test batches but not all. Removing these ions would require a reverse osmosis process or ion exchange. Ion removal is vital to a fully functional electrolyzer system as well. 

The authors seemed to be ultimately going after a platform to test and validate water purification processes for future lunar exploration missions. Given the results from their experimentation, there will undoubtedly be future rounds of testing and plenty of technology development to work on solving these technical challenges. Ultimately, astronauts will have to drink water on the Moon – and it won’t be coming just from bottles from Earth.

Learn More:
Freer, Pesch, & Zabel – Experimental study to characterize water contaminated by lunar dust
UT – The Moon Is Toxic
UT – Astronauts Will Be Tracking Dust Into the Lunar Gateway. Is This a Problem?
UT – Lunar Dust is Still One of The Biggest Challenges Facing Moon Exploration

Lead Image:
Turbidity samples of some of the dissolved regolith.
Credit – Freer, Pesch, & Zabel

The post Moon Dust Could Contaminate Lunar Explorers’ Water Supply appeared first on Universe Today.

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Gaia Hit by a Micrometeoroid AND Caught in a Solar Storm

ESA Gaia DR2 AllSky Brightness Colour black bg 8k 1024x645 1

For over ten years, the ESA’s Gaia Observatory has monitored the proper motion, luminosity, temperature, and composition of over a billion stars throughout our Milky Way galaxy and beyond. This data will be used to construct the largest and most precise 3D map of the cosmos ever made and provide insight into the origins, structure, and evolutionary history of our galaxy. Unfortunately, this sophisticated astrometry telescope is positioned at the Sun-Earth L2 Lagrange Point, far beyond the protection of Earth’s atmosphere and magnetosphere.

As a result, Gaia has experienced two major hazards in recent months that could endanger the mission. These included a micrometeoroid impact in April that disrupted some of Gaia‘s very sensitive sensors. This was followed by a solar storm in May—the strongest in 20 years—that caused electrical problems for the mission. These two incidents could threaten Gaia‘s ability to continue mapping stars, planets, comets, asteroids, quasars, and other objects in the Universe until its planned completion date of 2025.

Micrometeroids are a common problem at the L2 Lagrange Point, roughly 1.5 million km (932,057 mi) from Earth, so engineers designed Gaia with a protective cover. Unfortunately, the particle was traveling at a very high velocity and struck the cover at precisely the wrong angle, causing a breach. This has allowed stray sunlight to interfere with Gaia’s ability to simultaneously collect light from so many distant stars. Gaia‘s engineering team was addressing this issue the moment the solar storm hit, adding electrical issues to their list of problems.

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Gaia’s all-sky view of our Milky Way Galaxy and neighboring galaxies, based on measurements of nearly 1.7 billion stars. Credit: ESA

Mission controllers first noticed signs of disruption in May when Gaia began registering thousands of false detections. They soon realized that this may have been due to the solar storm that began on May 11th, which could have caused one of the spacecraft’s charge-coupled devices (CCDs) to fail, which converts light gathered by Gaia’s billion-pixel camera into electronic signals. The observatory relies on 106 CCDs, each playing a different role. The affected sensor was vital for Gaia’s ability to confirm the detection of stars and validate its observations.

While the spacecraft was built to withstand radiation, it has been operating in space for almost twice as long as originally planned (6 years) and may have been pushed to its limits. As Edmund Serpell, Gaia spacecraft operations engineer at ESOC, explained in an ESA press release:

“Gaia typically sends over 25 gigabytes of data to Earth every day, but this amount would be much, much higher if the spacecraft’s onboard software didn’t eliminate false star detections first. Both recent incidents disrupted this process. As a result, the spacecraft began generating a huge number of false detections that overwhelmed our systems. We cannot physically repair the spacecraft from 1.5 million km away. However, by carefully modifying the threshold at which Gaia’s software identifies a faint point of light as a star, we have been able to dramatically reduce the number of false detections generated by both the straylight and CCD issues.”

Meanwhile, the Gaia teams at ESA’s European Space Operations Centre (ESOC), the European Space Research and Technology Centre (ESTEC), and the European Space Astronomy Center (ESAC) have spent the past few months investigating these problems. They have also worked closely with engineers from Airbus Defence and Space (the spacecraft’s manufacturer) and payload experts at the Data Processing and Analysis Consortium. Thanks to their efforts, the GaiaObservatory recently returned to regular operations.

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Mountain Lakes of the Wind River Range—A Photo Gallery

Tet19 047 Me on Teton Crest Trail copy cropped 40

By Michael Lanza

We followed the Doubletop Mountain Trail as it rolled over open plateau country above 10,000 feet in the Wind River Range, crossing one gorgeous lake basin after another where wildflowers still carpeted the ground in the week before Labor Day. In the distance, peaks along the Continental Divide soared to over 13,000 feet, jabbing at the underbellies of clouds. Turning onto the Highline Trail, we reached an unnamed tarn in late afternoon and walked beyond it to a flat, broad bench overlooking a meadow and lake below a pair of huge towers, 12,119-foot Sky Pilot Peak and 12,224-foot Mount Oeneis. It was a serendipitous find to make our home for the night.

But the real magic arrived the next morning, when nature served up a perfect stew of conditions—calm air, dappled light, still water, and a stunning backdrop—to create a scene that validates carrying all the weight on your back for days (and makes for a pretty good photo, above).

Tet19 047 Me on Teton Crest Trail copy cropped 41
Hi, I’m Michael Lanza, creator of The Big Outside. Click here to sign up for my FREE email newsletter. Join The Big Outside to get full access to all of my blog’s stories. Click here for my e-books to classic backpacking trips. Click here to learn how I can help you plan your next trip.

Washakie Lake in the Wind River Range, Wyoming.
” data-image-caption=”Sunset light over Washakie Lake in the Wind River Range, Wyoming.
” data-medium-file=”https://i0.wp.com/tbo-media.sfo2.digitaloceanspaces.com/wp-content/uploads/2024/05/01072631/Wind9-45-Washakie-Lake-in-the-Wind-River-Range-WY.jpg?fit=300%2C200&ssl=1″ data-large-file=”https://i0.wp.com/tbo-media.sfo2.digitaloceanspaces.com/wp-content/uploads/2024/05/01072631/Wind9-45-Washakie-Lake-in-the-Wind-River-Range-WY.jpg?fit=900%2C600&ssl=1″ tabindex=”0″ role=”button” src=”https://i0.wp.com/tbo-media.sfo2.digitaloceanspaces.com/wp-content/uploads/2024/05/01072631/Wind9-45-Washakie-Lake-in-the-Wind-River-Range-WY-1024×683.jpg?resize=900%2C600&ssl=1″ alt=”Washakie Lake in the Wind River Range, Wyoming.” class=”wp-image-63052″ srcset=”https://tbo-media.sfo2.digitaloceanspaces.com/wp-content/uploads/2024/05/01072631/Wind9-45-Washakie-Lake-in-the-Wind-River-Range-WY.jpg 1024w, https://tbo-media.sfo2.digitaloceanspaces.com/wp-content/uploads/2024/05/01072631/Wind9-45-Washakie-Lake-in-the-Wind-River-Range-WY.jpg 300w, https://tbo-media.sfo2.digitaloceanspaces.com/wp-content/uploads/2024/05/01072631/Wind9-45-Washakie-Lake-in-the-Wind-River-Range-WY.jpg 768w, https://tbo-media.sfo2.digitaloceanspaces.com/wp-content/uploads/2024/05/01072631/Wind9-45-Washakie-Lake-in-the-Wind-River-Range-WY.jpg 150w, https://tbo-media.sfo2.digitaloceanspaces.com/wp-content/uploads/2024/05/01072631/Wind9-45-Washakie-Lake-in-the-Wind-River-Range-WY.jpg 1200w” sizes=”(max-width: 900px) 100vw, 900px” data-recalc-dims=”1″ />Sunset light over Washakie Lake in the Wind River Range, Wyoming.

I first began exploring Wyoming’s Wind River Range about 30 years ago and have returned many times since, drawn back again and again by its almost bottomless well of adventure potential. In that time, I’ve learned about the many reasons to walk for days through the Winds, which exist in the deep shadow of Grand Teton and Yellowstone national parks just a couple of hours to the north—a state of relative anonymity that many backpackers celebrate. Its lack of national park status and sheer vastness enable a high degree of solitude for backpackers willing to make the considerable effort (and take the time) to explore more deeply into the range, which extends for nearly 100 miles north to south.

And few mountain ranges match the grandiosity of the Wind River Range. The Colorado Rockies and High Sierra reach greater heights and I would include both among the handful of
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