FuturologyBot
FuturologyBot t1_j7u6wlt wrote
Reply to San Diego startup to build 3D printing factory that would almost triple its workforce by Gari_305
The following submission statement was provided by /u/Gari_305:
From the article
>The pilot facility aims to prove out Fabric8Labs’ ability to economically 3D print very complex parts, especially using copper, for its top target markets, which include semiconductor heat sinks and radio frequency antenna parts.
Also from the article
>To keep central processors in powerful computers for overheating, manufacturers deploy heat sink structures to better ventilate the space around the processors. Fabric8Labs can produce these increasingly intricate designs at scale through its non-thermal metal 3D printing process.
Note: This is a demo of their pitch they provided 2 years ago in order to provide reference and some context of their technique
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FuturologyBot t1_j7tsubc wrote
The following submission statement was provided by /u/BorgesBorgesBorges60:
You guys probably know by now that I love, love, bees. Thought I'd share this article about how a group of researchers in Finland have built a robot they claim could evolve into the first artificial pollinator:
>The robot resembles a dandelion seed and has several biomimetic features. Its porous structure and light weight (1.2mg) enable it to float in the air, directed by the wind. Notably, the robot can also adapt manually to wind direction and force by changing its shape. And thanks to a stable separated vortex ring generation it’s suitable for long-distance wind-assisted travelling.
One problem they've had, though, is sticking the landing:
>Nevertheless, the technology requires further research and collaboration with material scientists and microrobotics experts to address two main challenges: the precise control of the landing spot and reusing the device to make it biodegradable.
Full study here!
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FuturologyBot t1_j7qx60w wrote
Reply to A new lithium-air battery design promises unprecedented energy density | A potentially transformative technology for electrifying transportation by chrisdh79
The following submission statement was provided by /u/chrisdh79:
From the article: A new paper published in Science describes the chemistry behind a novel lithium-air battery, an innovative design which could potentially provide way more energy density than traditional li-ion battery technology. It could serve as a real breakthrough for the battery market and a possible revolution for transportation and heavy-duty vehicles such as airplanes, trains and even submarines.
The new battery can sustain more than 1,000 recharge cycles with just a small five percent drop in energy efficiency and zero impact on coulombic efficiency. This means that all the initial battery material was still active, with no irreversible side reactions during the charge/recharge cycles.
The design conceived by researchers at the Illinois Institute of Technology uses a solid electrolyte based on a ceramic-polyethylene oxide composite, which is safer and more efficient compared to liquid electrolytes. Ceramic and polymer materials used as solid electrolytes have their own downsides when used separately but when combined, they can provide both the high ionic conductivity of ceramic and the high stability of the polymer.
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FuturologyBot t1_j7q6dn0 wrote
Reply to Imagine a future in space where pellet-beam propulsion systems speed up travel to other worlds, pipelines on the Moon transport oxygen between settlements and Martian bricks grow on their own before being assembled into homes. Researchers will delve into these ideas and more using NASA grant funding by EricFromOuterSpace
The following submission statement was provided by /u/EricFromOuterSpace:
SS:
From the article:
The NASA Innovative Advanced Concepts (NIAC) program fosters innovation by funding early-stage studies to evaluate technologies that could support future missions. The latest round of awards will provide $175,000 grants to 14 visionaries from nine states. Ten of the selected researchers are first-time NIAC recipients.
“NASA dares to make the impossible possible. That’s only achievable because of the innovators, thinkers, and doers who are helping us imagine and prepare for the future of space exploration,” said NASA Administrator Bill Nelson. “The NIAC program helps give these forward-thinking scientists and engineers the tools and support they need to spur technology that will enable future NASA missions.”
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FuturologyBot t1_j7jlq98 wrote
The following submission statement was provided by /u/nastratin:
In the lab at least, its materials are stable for over 1,000 cycles
Current lithium-based batteries are based on intercalation—lithium ions squeeze into spaces within electrode materials such as graphite. As a result, most of the battery's volume and bulk is dedicated to things that don't contribute to carrying charges between the electrodes, which sets a limit on the sorts of energy densities that these technologies can reach.
As a result, a lot of research has gone into finding ways of getting rid of one these electrode materials. People have tried pairing lithium-metal electrodes with various materials, while other efforts have tried using electrodes where lithium reacts with air to form lithium-oxygen compounds. While these worked by some measures, they tended to have problems that drastically shortened their useful lifetimes.
But a recent paper describes a battery that uses lithium metal at one electrode and lithium air for the second. By some measures, the battery has decent performance out to over 1,000 charge/discharge cycles.
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FuturologyBot t1_j7ao95v wrote
The following submission statement was provided by /u/jormungandrsjig:
> New research published in Nature Physics by collaborating scientists from Stanford University in the U.S. and University College Dublin (UCD) in Ireland has shown that a novel type of highly-specialized analog computer, whose circuits feature quantum components, can solve problems from the cutting edge of quantum physics that were previously beyond reach. When scaled up, such devices may be able to shed light on some of the most important unsolved problems in physics.
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FuturologyBot t1_j77a1ea wrote
The following submission statement was provided by /u/10MinsForUsername:
Submission Statement:
This is a news article that elaborates how a team of scientists succeeded in growing up "mini guts" of humans inside mice. This is a useful advancement for humanity because it means we may be able to test some drugs or medicines on these mice without having to apply it on humans.
Which by turn, could help in developing some drugs for all of humanity. Or at least, test the side effects of already-existing drugs.
The Biotech applied is an impressive work, I invite you to read the article to see how it was done.
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FuturologyBot t1_j76ven2 wrote
The following submission statement was provided by /u/landlord2213:
Researchers at University College London and the University of Cambridge have discovered a new type of ice that more closely resembles liquid water than any other known ices and that may rewrite our understanding of water and its many anomalies.
The newly discovered ice is amorphous — that is, its molecules are in a disorganized form, not neatly ordered as they are in ordinary, crystalline ice. Amorphous ice, although rare on Earth, is the main type of ice found in space. That is because, in the colder environment of space, ice does not have enough thermal energy to form crystals.
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FuturologyBot t1_j71sxp8 wrote
Reply to Heart Disease Breakthrough: New Immune Target Discovered. Heart disease is a leading cause of death worldwide. Research has identified suPAR as a protein that contributes to the development of atherosclerosis and kidney disease, offering new opportunities for treatment. by Creepy_Toe2680
The following submission statement was provided by /u/Creepy_Toe2680:
Research has identified suPAR as a protein that contributes to the development of atherosclerosis and kidney disease, offering new opportunities for treatment.
Traditionally, clinicians have approached the treatment of cardiovascular disease by controlling diabetes and blood pressure, and utilizing medications such as aspirin and statins to lower cholesterol.
However, heart disease continues to be the leading cause of death in the United States. Even when risk factors are managed, many patients still experience heart attacks, according to Salim Hayek, M.D., physician-scientist and medical director of the University of Michigan Health Frankel Cardiovascular Clinics.
But a study led by Michigan Medicine has uncovered a protein produced by the immune system that causes atherosclerosis – the hardening of arteries that affects over a billion people worldwide – which offers the promise of new treatments.
“Targeting the immune component central to the development of atherosclerosis is the Holy Grail for the treatment of heart disease,” said Hayek, senior author of the study “This is the first time that a component of the immune system is identified that meets all the requirements for being a promising treatment target for atherosclerosis.”
This protein, called soluble urokinase plasminogen activator receptor, or suPAR, is produced by the bone marrow. It acts as a regulator, essentially a thermostat for the activity of the immune system, or “immunostat”.
Past studies have shown suPAR to be a marker of cardiovascular disease. But this study, published in the Journal of Clinical Investigation, is the first evidence showing that the protein actually causes atherosclerosis when at high levels.
Three-pronged findings
First, the research team analyzed the Multi-Ethnic Study of Atherosclerosis, which consists of over 5,000 people without known cardiovascular disease and found that those who had higher suPAR levels were much more prone to develop atherosclerosis and experience cardiovascular events, regardless of their underlying risk factors.
Then, the investigators did a genetic study of 24,000 people to find whether certain genetic variations affected levels of suPAR in blood. They discovered a specific variant in the gene PLAUR that codes for suPAR, and people with that genetic variant tended to have higher suPAR levels. Most importantly, that genetic variant was linked to atherosclerosis in a Mendelian randomization analysis of 500,000 participants in the UK Biobank, which was replicated in two other large data sets.
“We also found that participants lacking a copy of the PLAUR gene have a lower risk of heart disease,” said first author and geneticist George Hindy, M.D., Ph.D., of Regeneron Genetics Center. “Altogether, the genetic data is truly compelling for high suPAR being a cause of atherosclerosis.”
Finally, in mouse models with high suPAR levels, researchers saw a dramatic increase in atherosclerotic plaques of mouse aortas compared to mice with normal suPAR levels.
“Even prior to developing atherosclerosis, the mouse aortas with high suPAR levels contained more inflammatory white blood cells, and the immune cells circulating in the blood were in an activated state, or ‘attack-mode,’” said Daniel Tyrrell, Ph.D., co-first author and research fellow at the U-M Health Frankel Cardiovascular Center. “High suPAR levels appear to activate the immune cells and prime them to overreact to the high cholesterol environment, causing these cells to enter the blood vessel wall and accelerate the development of atherosclerosis.”
What is unique about this study, Hayek says, is that it brings to light high-quality clinical, genetic, and experimental data – all pointing to suPAR as a cause of atherosclerotic disease.
“Now, we’re looking into developing treatments to reduce suPAR levels safely as a strategy to prevent and treat heart disease, especially since traditional therapies for atherosclerosis have no impact on suPAR,” he said.
suPAR linking kidney and cardiovascular disease
The study dovetails findings that suPAR is known to be a pathogenic factor that causes kidney disease, which impacts one in seven Americans. People often experience the two conditions together: two-thirds of people with kidney disease are affected by cardiovascular disease, and over 40% of patients with cardiovascular disease have signs of kidney disease.
“This paper places suPAR as the link between kidney and cardiovascular disease; a common factor causing both through this inappropriate, persistent activation of the immune system,” said co-author Jochen Reiser, M.D., Ph.D., chair of the Department of Medicine at Rush University and an expert in the study of suPAR. “This is pointed out in the Mendelian randomization genetic analysis done by the investigators, showing that high suPAR is also linked to kidney disease.”
For both conditions, suPAR has long been known as a biomarker for poor outcomes and disease progression. In a 2020 study, Hayek’s team found that suPAR can worsen acute kidney injury and that blocking suPAR prevents it. A recent study led by Hayek found that levels of protein are high in patients with heart failure and predict death for patients.
Research into suPAR’s role in health and disease has advanced rapidly in the past 10 years. Hayek says suPAR has great potential to be a successful treatment target for cardiovascular and kidney disease. His lab has already begun work designing anti-suPAR therapies and planning clinical trials.
“My hope is that we are able to provide these treatments to our patients within the next three to five years,” he said. “This will be a game changer for the treatment of atherosclerotic and kidney disease”.
Reference: “Increased soluble urokinase plasminogen activator levels modulate monocyte function to promote atherosclerosis” by George Hindy, Daniel J. Tyrrell, Alexi Vasbinder, Changli Wei, Feriel Presswalla, Hui Wang, Pennelope Blakely, Ayse Bilge Ozel, Sarah Graham, Grace H. Holton, Joseph Dowsett, Akl C. Fahed, Kingsley-Michael Amadi, Grace K. Erne, Annika Tekmulla, Anis Ismail, Christopher Launius, Nona Sotoodehnia, James S. Pankow, Lise Wegner Thørner, Christian Erikstrup, Ole Birger Pedersen, Karina Banasik, Søren Brunak, Henrik Ullum, Jesper Eugen-Olsen, Sisse Rye Ostrowski, on behalf of the DBDS Consortium, Mary E. Haas, Jonas B. Nielsen, Luca A. Lotta, on behalf of the Regeneron Genetics Center, Gunnar Engström, Olle Melander, Marju Orho-Melander, Lili Zhao, Venkatesh L. Murthy, David J. Pinsky, Cristen J. Willer, Susan R. Heckbert, Jochen Reiser, Daniel R. Goldstein, Karl C. Desch and Salim S. Hayek, 4 October 2022, Journal of Clinical Investigation.
DOI: 10.1172/JCI158788
The study was funded by the National Heart, Lung, and Blood Institute (NHLBI), the Michigan Institute for Clinical & Health Research (MICHR), and the Gilead Sciences Research Scholar Program in Cardiovascular Disease.
Hayek and the University of Michigan have patents filed for the use of suPAR levels in the management of cardiovascular disease and the use anti-suPAR therapies as a strategy to prevent and treat atherosclerosis. Hayek and Reiser are scientific advisory board members of Walden Biosciences, a company devising therapeutics targeting suPAR in kidney disease. Hindy, Haas, Nielsen and Lotta receive salary, stocks and stock options from Regeneron Pharmaceuticals, Inc. Eugen-Olsen is a co-founder, shareholder, and chief scientific officer of Virogates and a named inventor on patents related to suPAR.
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FuturologyBot t1_j714ixm wrote
The following submission statement was provided by /u/hibott77:
A diagnostic test developed by Stanford Medicine scientists can separate bacterial and viral infections with 90% accuracy, the first to meet standards set by the World Health Organization
It is the first diagnostic test to meet (and exceed) the standards proposed by the World Health Organization and the Foundation for Innovative New Diagnostics.
“Antimicrobial resistance is continuously rising, so there has been a lot of effort to reduce inappropriate antibiotic usage,” said Purvesh Khatri, PhD, associate professor of medicine and biomedical data science, and the senior author of the paper. “Accurately diagnosing whether a patient has a bacterial or viral infection is one of the biggest global health challenges.”
Existing methods include growing the pathogen in a petri dish, which takes several days, or polymerase chain reaction (PCR) testing, which requires knowing the specific pathogen to look for.
That’s why in many cases, “Doctors prescribe antibiotics empirically,” Khatri said. “They say, ‘We’re going to give you an antibiotic and if you get better, you had a bacterial infection. If you don’t, you have a viral infection, and we’ll stop the antibiotic.’”
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FuturologyBot t1_j7045i5 wrote
The following submission statement was provided by /u/Phoenix5869:
From the article
Patients taking Keytruda for advanced melanoma were less likely to die, or have the skin cancer reoccur, if they also had the jab, mRNA-4157/V940, Moderna and MSD said.
The findings, in 157 patients, have not yet been scrutinised by independent experts or regulators.
More trials will be needed to check how effective the treatment might be.
Moderna's chief medical officer Paul Burton said: "This is a significant finding. It's the first randomised-trial testing of an mRNA therapeutic in cancer patients.
"It's shown a 44% relative reduction in the risk of dying of cancer or having your cancer progress. That's an important finding and I think it has the potential to be a new paradigm in the treatment of cancer patients."
Tailormade to match each patient's cancer, the vaccine is very expensive to make - although, the company has not named a price.
Prof Alan Melcher from The Institute of Cancer Research said: "There's no question, this is very exciting. These results show the feasibility of making and delivering personalised vaccines to treat cancer, and that the vaccine can add benefit to current treatments.
"These results establish the principle that this complex technology is doable."
Consultant colorectal surgeon at the University of Birmingham Mr Andrew Beggs said: "Although early data, it is very encouraging that this is a likely effective treatment option in the future.
"This advance is likely to have important implications for metastatic cancer patients in the future and opens a new therapeutic avenue for these patients."
Dr Sam Godfrey from Cancer Research UK, said: "There is unlikely to be a single cure for cancer and we must focus on ways to tailor treatment for patients. These results are grounds for optimism that the science which helped get us out of the pandemic could add another powerful treatment option for cancer in the future."
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FuturologyBot t1_j6y5fb0 wrote
Reply to Future humans living on the Moon and Mars may one day live in homes grown from mushrooms by mancinedinburgh
The following submission statement was provided by /u/mancinedinburgh:
I think the point behind yet another gimmicky-sounding project is that it would mean less foreign microbes from humans/Earth contaminating the moon or Mars. Also, apparently this particular fungus makes a biomass building material (which can easily be transported into space) that is “stronger than concrete” when mixed with a certain type of algae. Who knew?
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FuturologyBot t1_j6x7txb wrote
The following submission statement was provided by /u/kelev11en:
Submission statement: New reporting finds that it's not just that CNET let an AI publish news articles that were later shown to be substantially fabricated and plagiarized. It's actually a lot worse -- at internal meetings before they deployed the AI, leadership acknowledged the factual errors and plagiarism, but ultimately chose to deploy the AI anyway. In the end, more than 50 percent of its articles required significant corrections for factual mistakes and plagiarism.
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FuturologyBot t1_j6sasoq wrote
Reply to The steam engine changed the world. Artificial intelligence could destroy it. - The Boston Globe by GlobeOpinion
The following submission statement was provided by /u/GlobeOpinion:
From Will Henshall:
>In 1790, China was responsible for one-third of the world’s manufacturing output while Europe collectively accounted for one-quarter. But then the Industrial Revolution occurred in Europe, and by 1900, Europe accounted for 62 percent of the world’s manufacturing, while China accounted for only 6 percent. Europe’s greater economic strength was part of the reason that the European countries were able to subjugate China during what came to be known there as the “century of humiliation.”
Given China’s experience, it is unsurprising that China is competing with the United States to lead the development of the next transformational technology: artificial intelligence. This competition comes with huge risks. If the United States and China don’t find ways to reduce these risks, both countries could face catastrophe.
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FuturologyBot t1_j6qa93a wrote
The following submission statement was provided by /u/Gari_305:
From the article
>Indeed, computer-based AI appears to be advancing at an unprecedented rate. But the rate of advancement in robotics – which we could think of as the potential physical embodiment of AI – is slow.
>
>Could it be that future AI systems will need robotic “bodies” to interact with the world? If so, will nightmarish ideas like the self-repairing, shape-shifting T-1000 robot from the Terminator 2 movie come to fruition? And could a robot be created that could “live” forever?
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FuturologyBot t1_j5kyvwr wrote
The following submission statement was provided by /u/221missile:
This is part of US army's M-SHORAD effort which seeks to field an effective solution to the drone swarm problem.
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FuturologyBot t1_j5ife4a wrote
Reply to The Next Generation of Humans: Nanobots by crua9
The following submission statement was provided by /u/crua9:
This is more than less my view on what future life could be like with nanobots. It should be noted that while the ideas are mine, and it was a struggle. Many of the words in this was written by several AI. Basically I was using them to create a logical flow.
Anyways, part 1 is a good summary of the rest of the post.
__________
Nanotechnology is a rapidly evolving field with the potential to revolutionize medicine in the future. One of the most promising applications of nanotechnology is the use of nanobots in medicine. Nanobots are microscopic robots that can be programmed to perform specialized activities such as disease diagnosis and treatment. They can be used to diagnose and treat a wide range of conditions, including mental illnesses such as depression and anxiety, as well as physical injuries and illnesses.
One of the most interesting potential applications of nanobots in medicine is the treatment of mental illnesses. Mental illnesses are among the most common and devastating diseases of our time. They can be programmed to constantly map the brain and correct faults as they develop. Alzheimer's disease may theoretically be treated if a person was implanted with nanobots at birth.
Nanobots also have the potential to transform the treatment of physical injuries and illnesses. They can be designed to heal and even replace damaged cells and organs if necessary. Nanobots could be utilized to replace a damaged heart or liver, or to heal a shattered bone, for example. They could also be utilized to replace and upgrade all body components.
Another possible medical application for nanobots is the boosting of healthy cells and organs. They can be programmed to improve the operation of healthy cells and organs, making them more powerful, efficient, and resilient. They could potentially render plastic surgery obsolete by gradually changing traits that people dislike.
Nanobots have the potential to revolutionize medicine in the future, offering new possibilities for the diagnosis and treatment of mental illnesses and physical injuries. They can also improve the performance of healthy cells and organs and render plastic surgery obsolete.
_________________
​
I also get into other things like how nanobots could be used with education, jobs, and so on.
Please note the site has a TTS. So you could have it read you the post in the background.
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FuturologyBot t1_j5i0xn2 wrote
The following submission statement was provided by /u/tonymmorley:
New mRNA vaccine factory is made from shipping containers — Each “BioNTainer” can produce 50 million COVID-19 vaccine doses per year. Kristin Houser for Freethink, January 22nd, 2023
>"German biotech company BioNTech is sending a modular mRNA vaccine factory to Rwanda to allow the country to produce more COVID-19 shots for Africa, in Africa — and perhaps one day help the continent easily vaccinate its citizens against other deadly diseases, too."
​
>"This factory consists of two modules, each made from six shipping containers. In the first module, mRNA is produced and purified. In the second, it is made into a vaccine. Local partners can then package the mRNA vaccine into doses."
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FuturologyBot t1_j5gb3mc wrote
The following submission statement was provided by /u/filosoful:
BioMonde supplies greenbottle larvae for treatment of non-squeamish patients across Europe
Hundreds of UK health service hospitals as well as clinics in Germany are using maggots to clean chronic wounds such as diabetic leg ulcers and speed up the healing process – reviving a centuries-old tradition practised by Maya tribes in Central America and Indigenous Australians.
During the first world war, the US doctor William Baer realised wounds with maggots in them healed much faster than those without. He started growing larvae on a hospital windowsill to treat patients with osteomyelitis, a bone inflammation.
By the end of the 1930s, 300 hospitals in the US and Canada were using maggots, but their use declined with the arrival of penicillin and other antibiotics, only to be rediscovered in the 1990s amid growing antibiotic resistance.
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FuturologyBot t1_j5fuwp1 wrote
Reply to Seattle-based Jetoptera is developing a vertical takeoff aircraft that can travel at almost 1,000 km/h with a radically simplified new type of engine. With almost no moving parts, it uses super-compressed air to create vortexes for thrust. by lughnasadh
The following submission statement was provided by /u/lughnasadh:
Submission Statement
Should this technology work as envisaged, I would assume it will be considerably cheaper than existing aircraft designs. As with electric cars, fewer moving parts means easier to build and less need for maintenance.
Though I'm not sure that will make much difference to the economics of flying taxis. There are lots of reasons to question if they will ever make sense, from a business point of view, even with cheaper aircraft.
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FuturologyBot t1_j5bdb5n wrote
The following submission statement was provided by /u/upyoars:
> Winds on Mars have around 99 percent less force compared to the winds of the same speed on Earth since Mars has a thinner atmosphere. Studies conducted on Martian winds were usually for landing or single assessments of mountainous ridges and they didn’t offer the full picture of the planet’s potential for wind energy, which can be different in different times of the day.
> Researchers made use of a global climate model originally designed for Earth, to look at wind movement on the red planet. They used detailed info about Mars such as precise landscape, heat, energy, dust levels, solar radiation levels etc. which were taken from maps generated by Mars Global Surveyor and Viking missions.
> Based on this info, they created a simulation to show the kind of wind speeds seen across the planet during the day, night and its seasons.
> Researchers saw that the wind energy was not just capable of complementing solar energy, especially during night and dust storms that block out sunlight, but even capable of completely replacing it in some areas. It showed the most potential around the Martian crater rims and the volcanic highlands.
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FuturologyBot t1_j5b17sz wrote
Reply to Exploring the Star Systems Orbiting the Black Hole at the Center of our Galaxy by johnkoubeck
The following submission statement was provided by /u/johnkoubeck:
Submission Statement: further exploration of the star systems orbiting the black hole at the center of our galaxy can help us to better understand the universe and its complexities. It is clear that these star systems provide insight into how galaxies form and evolve over time, as well as how they interact with one another. Additionally, understanding these star systems offers clues to how a black hole behaves at the center of a galaxy.
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FuturologyBot t1_j585xvg wrote
The following submission statement was provided by /u/Gari_305:
From the Article
>The European Space Agency (Esa) project team behind Juice held a major review this week and concluded the mission was "go for launch".
>
>Aerospace company Airbus has spearheaded the construction of the €1.6bn (£1.4bn; $1.7bn) JUpiter ICy moons Explorer.
>
>The manufacturer has pulled in expertise and components from all across the continent.
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FuturologyBot t1_j57clwk wrote
The following submission statement was provided by /u/TheBestinHealth:
I think this post constitutes this sub reddit well due to the fact that is talks about the growing influence of a developing AI: ChaptGPT, it talks about in tech related professionals and how they are becoming more and more friendly towards ChaptGPT at a huge scale within weeks of its release making it a huge technological advancement for the future of science and tech.
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FuturologyBot t1_j7uhy29 wrote
Reply to A solution to the climate crisis: mining the moon, researchers say. by Vucea
The following submission statement was provided by /u/Vucea:
Astrophysicists propose geoengineering solution to climate warming
Proponents of a "moonshot" idea to deal with global heating have been handed a new, very literal, interpretation by researchers who have proposed firing plumes of moon dust from a gun into space in order to deflect the sun’s rays away from Earth.
The seemingly outlandish concept, outlined in a new research paper, would involve creating a "solar shield" in space by mining the moon of millions of tons of its dust and then "ballistically eject[ing]" it to a point in space about 1m miles from Earth, where the floating grains would partially block incoming sunlight.
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