Space and Tech
Jupiter’s moons hide giant subsurface oceans − Europa Clipper is one of 2 missions on their way to see if these moons could support life
NASA’s Europa Clipper and ESA’s JUICE missions aim to explore Jupiter’s icy moons, focusing on the potential habitability of their underground oceans, particularly Europa’s, by gathering vital scientific data.
On Oct. 14, 2024, NASA launched a robotic spacecraft named Europa Clipper to Jupiter’s moons. Clipper will reach the ice-covered Jovian moon Europa in 2030 and spend several years collecting and sending valuable data on the moon’s potential habitability back to Earth.
Clipper isn’t the only mission highlighting researchers’ interest in Jupiter and its moons.
On April 13, 2023, the European Space Agency launched a rocket carrying a spacecraft destined for Jupiter. The Jupiter Icy Moons Explorer – or JUICE – will spend at least three years on Jupiter’s moons after it arrives in 2031.
I’m a planetary scientist who studies the structure and evolution of solid planets and moons in the solar system.
There are many reasons my colleagues and I are looking forward to getting the data that Europa Clipper and JUICE will hopefully be sending back to Earth in the 2030s. But perhaps the most exciting information will have to do with water. Three of Jupiter’s moons – Europa, Ganymede and Callisto – are home to large, underground oceans of liquid water that could support life.
Meet Io, Europa, Ganymede and Callisto
Jupiter has dozens of moons. Four of them in particular are of interest to planetary scientists.
Io, Europa, Ganymede and Callisto are, like Earth’s Moon, relatively large, spherical complex worlds. Two previous NASA missions have sent spacecraft to orbit the Jupiter system and collected data on these moons. The Galileo mission orbited Jupiter from 1995 to 2003 and led to geological discoveries on all four large moons. The Juno mission is still orbiting Jupiter today and has provided scientists with an unprecedented view into Jupiter’s composition, structure and space environment.
These missions and other observations revealed that Io, the closest of the four to its host planet, is abuzz with geological activity, including lava lakes, volcanic eruptions and tectonically formed mountains. But it is not home to large amounts of water.
Europa, Ganymede and Callisto, in contrast, have icy landscapes. Europa’s surface is a frozen wonderland with a young but complex history, possibly including icy analogs of plate tectonics and volcanoes. Ganymede, the largest moon in the entire solar system, is bigger than Mercury and has its own magnetic field generated internally from a liquid metal core. Callisto appears somewhat inert compared to the others, but serves as a valuable time capsule of an ancient past that is no longer accessible on the youthful surfaces of Europa and Io.
Most exciting of all: Europa, Ganymede and Callisto all almost certainly possess underground oceans of liquid water.
Ocean worlds
Europa, Ganymede and Callisto have chilly surfaces that are hundreds of degrees below zero. At these temperatures, ice behaves like solid rock.
But just like Earth, the deeper underground you go on these moons, the hotter it gets. Go down far enough and you eventually reach the temperature where ice melts into water. Exactly how far down this transition occurs on each of the moons is a subject of debate that scientists hope to resolve with JUICE and Europa Clipper. While the exact depths are still uncertain, scientists are confident that these oceans exist.
The best evidence of these oceans comes from Jupiter’s magnetic field. Saltwater is electrically conductive. So as these moons travel through Jupiter’s magnetic field, they generate a secondary, smaller magnetic field that signals to researchers the presence of an underground ocean. Using this technique, planetary scientists have been able to show that the three moons contain underground oceans. And these oceans are not small – Europa’s ocean alone might have more than double the water of all of Earth’s oceans combined.
An obvious and tantalizing next question is whether these oceans can support extraterrestrial life. Liquid water is an important piece of what makes for a habitable world, but far from the only requirement for life. Life also needs energy and certain chemical compounds in addition to water to flourish. Because these oceans are hidden beneath miles of solid ice, sunlight and photosynthesis are out. But it’s possible other sources could provide the needed ingredients.
On Europa, for example, the liquid water ocean overlays a rocky interior. That rocky seafloor could provide energy and chemicals through underwater volcanoes that could make Europa’s ocean habitable. But it is also possible that Europa’s ocean is a sterile, inhospitable place – scientists need more data to answer these questions.
Upcoming missions from ESA and NASA
Europa Clipper and JUICE are set up to give scientists game-changing information about the potential habitability of Jupiter’s moons. While both missions will gather data on multiple moons, JUICE will spend time orbiting and focusing on Ganymede, and Europa Clipper will make dozens of close flybys of Europa.
Both of the spacecraft will carry a suite of scientific instruments built specifically to investigate the oceans. Onboard radar will allow Europa Clipper and JUICE to probe into the moons’ outer layers of solid ice. Radar could reveal any small pockets of liquid water in the ice, or, in the case of Europa, which has a thinner outer ice layer than Ganymede and Callisto, hopefully detect the larger ocean.
Magnetometers will also be on both missions. These tools will give scientists the opportunity to study the secondary magnetic fields produced by the interaction of conductive oceans with Jupiter’s field in great detail and will hopefully give researchers clues to salinity and volumes of the oceans.
Scientists will also observe small variations in the moons’ gravitational pulls by tracking subtle movements in both spacecrafts’ orbits, which could help determine if Europa’s seafloor has volcanoes that provide the needed energy and chemistry for the ocean to support life.
Finally, both craft will carry a host of cameras and light sensors that will provide unprecedented images of the geology and composition of the moons’ icy surfaces.
Maybe one day, a spacecraft will be able to drill through the miles of solid ice on Europa, Ganymede or Callisto and explore oceans directly. Until then, observations from spacecraft like Europa Clipper and JUICE are scientists’ best bet for learning about these ocean worlds.
When Galileo discovered these moons in 1609, they were the first objects known to directly orbit another planet. Their discovery was the final nail in the coffin of the theory that Earth – and humanity – resides at the center of the universe. Maybe these worlds have another humbling surprise in store.
This article, originally published April 10, 2023, has been updated with details about the Europa Clipper launch.
Mike Sori, Assistant Professor of Planetary Science, Purdue University
This article is republished from The Conversation under a Creative Commons license. Read the original article.
The science section of our news blog STM Daily News provides readers with captivating and up-to-date information on the latest scientific discoveries, breakthroughs, and innovations across various fields. We offer engaging and accessible content, ensuring that readers with different levels of scientific knowledge can stay informed. Whether it’s exploring advancements in medicine, astronomy, technology, or environmental sciences, our science section strives to shed light on the intriguing world of scientific exploration and its profound impact on our daily lives. From thought-provoking articles to informative interviews with experts in the field, STM Daily News Science offers a harmonious blend of factual reporting, analysis, and exploration, making it a go-to source for science enthusiasts and curious minds alike. https://stmdailynews.com/category/science/
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Brightline West Project
As a passionate advocate for modern transportation, I am beyond excited about the latest development in American rail: the Brightline West project, which is officially one step closer to reality with the recent signing of a $3 billion grant agreement by the Federal Railroad Administration (FRA)! This project isn’t just another rail line; it’s a historic leap forward for high-speed rail in the U.S. and a beacon of progress for public transportation enthusiasts like myself.
On September 26, 2024, this monumental agreement was finalized, marking the beginning of what many of us have dreamed about for decades—true high-speed rail connecting Las Vegas to Southern California! With trains capable of reaching speeds over 200 miles per hour, we’re talking about radically transforming how we travel between these two bustling regions.
To have a project of this magnitude come to life thanks to a strong public-private partnership is inspiring. Just look at the numbers: over 35,000 jobs are expected to be created, including 10,000 union construction jobs. This is a huge win, not only for those in the industry but also for local economies and communities, and it sets a precedent for future infrastructure efforts across the country.
Michael Reininger, the CEO of Brightline, really hit the nail on the head with his assertion that this project will “jumpstart the high-speed rail industry in America.” It’s long overdue, and finally, we are moving forward. The Brightline West project won’t just connect cities; it will embody a bold, eco-friendly approach to our transportation challenges—reducing CO2 emissions by over 400,000 tons annually and removing three million cars off the roads that currently choke the I-15.
Imagine this: a seamless, comfortable two-hour journey from Las Vegas to Rancho Cucamonga, complete with onboard amenities like food and Wi-Fi. For someone who routinely endures the endless traffic jams on the freeway, the thought of relaxing in a sleek train while taking in the stunning California desert views excites me beyond measure! No more cramped airplane seats or endless hours stuck in a car; we’ll be able to travel in style and comfort.
And it warms my heart to see the emphasis on sustainability and environmental responsibility. The fact that Brightline West will utilize zero-emission, fully electric trains positions it as the premiere green transportation choice in America. It’s initiatives like these that give me hope for our future and showcase how modern rail can lead the way in combating climate change.
Heavy construction is slated to kick off in 2025, and early groundwork is already ongoing. Crews are busy drilling geotechnical borings along the I-15, and I can practically feel the anticipation in the air! Soon enough, we’ll see new stations sprouting up, including one right in the heart of Las Vegas—a city known for its bright lights and bustling energy!
As someone who often travels for both leisure and business, I am particularly looking forward to the role this project will play as we approach the 2028 Olympic Games in Los Angeles. Brightline West will undoubtedly serve as an essential transport option for visitors and residents alike, highlighting what a modern transportation system can achieve.
In closing, there’s so much to be excited about! The Brightline West project calls forth a vision of the future that is connected, rapid, and environmentally conscious. It represents the culmination of years of advocacy, dreaming, and hard work. I look forward to seeing how this journey unfolds as we ride the rails toward a new era in American transportation.
Here’s to the future of rail in America! 🚄🌟
Until next time, happy rail journeys, everyone!
This post is inspired by the recent developments surrounding the Brightline West project.
https://www.brightlinewest.com
The Bridge is a section of the STM Daily News Blog meant for diversity, offering real news stories about bona fide community efforts to perpetuate a greater good. The purpose of The Bridge is to connect the divides that separate us, fostering understanding and empathy among different groups. By highlighting positive initiatives and inspirational actions, The Bridge aims to create a sense of unity and shared purpose. This section brings to light stories of individuals and organizations working tirelessly to promote inclusivity, equality, and mutual respect. Through these narratives, readers are encouraged to appreciate the richness of diverse perspectives and to participate actively in building stronger, more cohesive communities.
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Tech
A third of the world’s population lacks internet connectivity − airborne communications stations could change that
Mohamed-Slim Alouini, King Abdullah University of Science and Technology and Mariette DiChristina, Boston University
About one-third of the global population, around 3 billion people, don’t have access to the internet or have poor connections because of infrastructure limitations, economic disparities and geographic isolation.
Today’s satellites and ground-based networks leave communications gaps where, because of geography, setting up traditional ground-based communications equipment would be too expensive.
High-altitude platform stations – telecommunications equipment positioned high in the air, on uncrewed balloons, airships, gliders and airplanes – could increase social and economic equality by filling internet connectivity gaps in ground and satellite coverage. This could allow more people to participate fully in the digital age.
One of us, Mohamed-Slim Alouini, is an electrical engineer who contributed to an experiment that showed it is possible to provide high data rates and ubiquitous 5G coverage from the stratosphere. The stratosphere is the second lowest layer of the atmosphere, ranging from 4 to 30 miles above the Earth. Commercial planes usually fly in the lower part of the stratosphere. The experiment measured signals between platform stations and users on the ground in three scenarios: a person staying in one place, a person driving a car and a person operating a boat.
My colleagues measured how strong the signal is in relation to interference and background noise levels. This is one of the measures of network reliability. The results showed that the platform stations can support high-data-rate applications such as streaming 4K resolution videos and can cover 15 to 20 times the area of standard terrestrial towers.
Early attempts by Facebook and Google to commercially deploy platform stations were unsuccessful. But recent investments, technological improvements and interest from traditional aviation companies and specialized aerospace startups may change the equation.
The goal is global connectivity, a cause that brought the platform stations idea recognition in the World Economic Forum’s 2024 Top 10 Emerging Technologies report. The international industry initiative HAPS Alliance, which includes academic partners, is also pushing toward that goal.
Fast, cost effective, flexible
Platform stations would be faster, more cost effective and more flexible than satellite-based systems.
Because they keep communications equipment closer to Earth than satellites, the stations could offer stronger, higher-capacity signals. This would enable real-time communications speedy enough to communicate with standard smartphones, high-resolution capabilities for imaging tasks and greater sensitivity for sensing applications. They transmit data via free-space optics, or light beams, and large-scale antenna array systems, which can send large amounts of data quickly.
Satellites can be vulnerable to eavesdropping or jamming when their orbits bring them over adversarial countries. But platform stations remain within the airspace of a single country, which reduces that risk.
High-altitude platform stations are also easier to put in place than satellites, which have high launch and maintenance costs. And the regulatory requirements and compliance procedures required to secure spots in the stratosphere are likely to be simpler than the complex international laws governing satellite orbits. Platform stations are also easier to upgrade, so improvements could be deployed more quickly.
Platform stations are also potentially less polluting than satellite mega-constellations because satellites burn up upon reentry and can release harmful metals into the atmosphere, while platform stations can be powered by clean energy sources such as solar and green hydrogen.
The key challenges to practical platform stations are increasing the amount of time they can stay aloft to months at a time, boosting green onboard power and improving reliability – especially during automated takeoff and landing through the lower turbulent layers of the atmosphere.
Beyond satellites
Platform stations could play a critical role in emergency and humanitarian situations by supporting relief efforts when ground-based networks are damaged or inoperative.
The stations could also connect Internet of Things (IoT) devices and sensors in remote settings to better monitor the environment and manage resources.
In agriculture, the stations could use imaging and sensing technologies to help farmers monitor crop health, soil conditions and water resources.
Their capability for high-resolution imaging could also support navigation and mapping activities crucial for cartography, urban planning and disaster response.
The stations could also do double duty by carrying instruments for atmospheric monitoring, climate studies and remote sensing of Earth’s surface features, vegetation and oceans.
From balloons to airplanes
Platform stations could be based on different types of aircraft.
Balloons offer stable, long-duration operation at high altitudes and can be tethered or free-floating. Airships, also known as dirigibles or blimps, use lighter-than-air gases and are larger and more maneuverable than balloons. They’re especially well suited for surveillance, communications and research.
Gliders and powered aircraft can be controlled more precisely than balloons, which are sensitive to variations in wind speed. In addition, powered aircraft, which include drones and fixed-wing airplanes, can provide electricity to communication equipment, sensors and cameras.
Next-generation power
Platform stations could make use of diverse power sources, including increasingly lightweight and efficient solar cells, high-energy-density batteries, green hydrogen internal combustion engines, green hydrogen fuel cells, which are now at the testing stage, and eventually, laser beam powering from ground- or space-based solar stations.
The evolution of lightweight aircraft designs coupled with advancements in high-efficiency motors and propellers enable planes to fly longer and carry heavier payloads. These cutting-edge lightweight planes could lead to platform stations capable of maneuvering in the stratosphere for extended periods.
Meanwhile, improvements in stratospheric weather models and atmospheric models make it easier to predict and simulate the conditions under which the platform stations would operate.
Bridging the global digital divide
Commerical deployment of platform stations, at least for post-disaster or emergency situations, could be in place by the end of the decade. For instance, a consortium in Japan, a country with remote mountainous and island communities, has earmarked US$100 million for solar-powered, high-altitude platform stations.
Platform stations could bridge the digital divide by increasing access to critical services such as education and health care, providing new economic opportunities and improving emergency response and environmental monitoring. As advances in technology continue to drive their evolution, platform stations are set to play a crucial role in a more inclusive and resilient digital future.
Mohamed-Slim Alouini, Distinguished Professor of Electrical and Computer Engineering, King Abdullah University of Science and Technology and Mariette DiChristina, Dean and Professor of the Practice in Journalism, College of Communication, Boston University
This article is republished from The Conversation under a Creative Commons license. Read the original article.
STM Daily News is a vibrant news blog dedicated to sharing the brighter side of human experiences. Emphasizing positive, uplifting stories, the site focuses on delivering inspiring, informative, and well-researched content. With a commitment to accurate, fair, and responsible journalism, STM Daily News aims to foster a community of readers passionate about positive change and engaged in meaningful conversations. Join the movement and explore stories that celebrate the positive impacts shaping our world.
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Space and Tech
Celebrating Pioneers of the Space Race: Highlights from NASA’s Hidden Figures Congressional Gold Medal Ceremony
On Wednesday, a significant moment in history was commemorated as NASA Administrator Bill Nelson delivered poignant remarks at the Hidden Figures Congressional Gold Medal ceremony in Washington. This ceremony recognized the groundbreaking contributions of the women who played crucial roles in America’s space race, particularly the extraordinary mathematicians whose work was integral to the success of the Apollo program.
Hidden Figures Congressional Gold Medal
Nelson began his address by honoring the pioneers whose efforts laid the foundation for NASA’s achievements. He acknowledged the remarkable women of the Mercury, Gemini, and Apollo programs, specifically recognizing trailblazers like Mary Jackson, Katherine Johnson, Dorothy Vaughan, and Dr. Christine Darden. These women defied social norms and shattered barriers to help ensure that humanity took its first steps on the Moon.
The ceremony was a tribute not only to these mathematical geniuses but also to the collective efforts of the individuals and lawmakers who championed this recognition. Nelson expressed gratitude to the late Congresswoman Eddie Bernice Johnson and current lawmakers like Senator Chris Coons, Senators Lisa Murkowski, Shelley Moore Capito, and Congressman Frank Lucas, who worked diligently to make these medals a reality. Their efforts highlighted the importance of acknowledging those whose contributions often go unnoticed but are vital to the fabric of American history.
“You see, the women we honor today made it possible for Earthlings to lift beyond the bounds of Earth, and for generations of trailblazers to follow,” Nelson stated. This sentiment reflects a profound appreciation for the legacy these women have left and the inspiration they continue to provide for current and future generations of scientists, engineers, and explorers.
Nelson also spotlighted Andrea Mosie, a NASA veteran who has dedicated nearly 50 years to the agency. As the lead processor for the Apollo sample program, Mosie oversees the Moon rocks and lunar samples collected during the Apollo missions—an astonishing 842 pounds of materials that hold untold scientific value. Her presence at the ceremony served as a reminder of how the legacy of the ‘Hidden Figures’ persists in NASA’s ongoing mission and work.
As Nelson remarked, “We did not come this far only to come this far.” His words resonate with the notion that the spirit of these pioneers lives on as NASA continues to push the boundaries of exploration. With eyes set on future missions to the Moon and beyond, including Mars, the agency dreams not just of celebrating past achievements but of building upon them and inspiring new generations to reach for the stars.
The Hidden Figures Congressional Gold Medal ceremony was a powerful reminder of the courage, intelligence, and tenacity of the women who transformed the landscape of space exploration. As NASA honors these figures, it also embraces a future where diversity and inclusion are celebrated as pivotal to innovation and progress in the cosmos.
For more information about NASA missions, visit:
The science section of our news blog STM Daily News provides readers with captivating and up-to-date information on the latest scientific discoveries, breakthroughs, and innovations across various fields. We offer engaging and accessible content, ensuring that readers with different levels of scientific knowledge can stay informed. Whether it’s exploring advancements in medicine, astronomy, technology, or environmental sciences, our science section strives to shed light on the intriguing world of scientific exploration and its profound impact on our daily lives. From thought-provoking articles to informative interviews with experts in the field, STM Daily News Science offers a harmonious blend of factual reporting, analysis, and exploration, making it a go-to source for science enthusiasts and curious minds alike. https://stmdailynews.com/category/science/
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