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Behold, the Solar System in All its X-ray Glory
The Universe looks mighty impressive when visualized with X-ray instruments. More importantly, X-ray images provide vital scientific insights by revealing features in the Universe that are not observable in visible light. The same is true of our Solar System, which has been difficult because of the challenges of separating local emissions from the rest of the Milky Way galaxy. In a recent study, a team from the Max Planck Institute for Extraterrestrial Physics (MPE) managed, for the first time, to disentangle the X-ray glow of our Solar System from deep space.
This was based on data obtained by the extended ROentgen Survey with an Imaging Telescope Array (eROSITA), an instrument aboard the Russian-German Spectrum-Roentgen-Gamma (SRG) observatory, between 2019 and 2021. The four sky maps produced from this enabled the extraction of solar wind charge exchange (SWCX) emissions from the cosmic background, providing the clearest view of the Solar System’s soft X-ray glow to date.
The soft X-ray glow arises when highly charged solar wind ions (like carbon and oxygen) capture electrons from neutral atoms in Earth’s upper atmosphere (geocorona) and elsewhere in the heliosphere. Based on data collected between 2019 and 2021. Previously, scientists believed that the SWCX was merely signal interference since it affected every study of the X-ray sky, skewing temperature and density measurements. These are vital to cosmological models, which makes the new data vital to our understanding of how the Universe has evolved over billions of years.
Illustration of the separation of the SWCX foreground emission from the cosmic X-ray sky, for the Western Galactic hemisphere. Credit: K. Dennerl (MPE)
The SRG/eROSITA telescope enabled this through the telescope’s unique location (around the L2 Lagrange Point), which avoids X-ray interference from Earth’s geocorona. Its ability to conduct long-term observations from solar minimum onwards also allowed researchers to track changes in X-ray levels driven by solar activity. By comparing observations, the team isolated the heliospheric component and reconstructed the soft X-ray sky as it would appear from outside the Solar System.
They also enable (for the first time) the study of the heavy-ion content of the solar wind, how it variability, and its interaction with the interstellar medium (ISM). The data also revealed an evolution of X-ray emissions, with increased solar activity leading to observable changes at different latitudes. This confirms previous research showing reduced X-ray emissions around the Sun’s polar regions at solar minimum, a phenomenon known as a “polar hole” that closes as activity increases.
Further analysis of the data revealed a localized region near Earth’s orbit with enhanced X-ray emissions that doesn’t orbit the Sun. This is the result of the “interstellar breeze,” helium atoms that pass through the Solar System as it moves through the Milky Way. This confirmed yet another prediction dating back to the 1970s: that the Sun’s gravity creates a “helium focusing cone.” In essence, the Sun’s gravity bends the trajectories of these atoms, creating a concentrated stream on the “downwind” side.
By combining solar wind measurements and data on the distribution of matter in the ISM, the team produced time-resolved three-dimensional models of the SWCX emissions. This revealed that emissions originate predominantly from spiral structures driven by variations in solar wind speed, primarily within Mars’ orbit, which (when averaged over time) show the cone clearly. These findings represent a paradigm shift in soft X-ray astronomy, turning what was considered a contaminating nuisance into a powerful diagnostic tool. As team lead Konrad Dennerl noted in a MPE press release:
Tracking how the solar wind modifies the appearance of the X-ray sky over time not only allows us to clean up observations of the distant universe but also provides unprecedented insights into solar physics and heliospheric dynamics. Understanding our Solar System’s X-ray emission is the key to properly interpreting observations of the diffuse X-ray sky.
The paper describing their findings, “Determination of the Solar System contribution to the soft X-ray sky,” recently appeared in the journal Science.
Further Reading: MPE
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Amid Knicks celebration, LAPD kills family dog in SoCal
A celebration of the New York Knicks’ NBA championship ended in tragedy for a Canoga Park woman this weekend after police officers fatally shot her dog, sparking public outrage.
A video circulating on social media shows a woman sobbing in the hallway of an apartment complex, hugging her dog, who was wearing a New York Knicks T-shirt, as six L.A. police officers stood by.
“The Knicks just won a championship, we were so happy,” she yells out, petting her dog.
Shortly after, the video shows her yelling out the name Jeremiah. Her family said she was yelling out the name of her son, who was on the phone in a video chat with her when the shooting happened.
The Los Angeles Police Department said in a written statement that the shooting occurred Saturday shortly before 9 p.m. in the 7500 block of Jordan Avenue.
Police said officers responded to a call about a “screaming woman” and were directed to an apartment unit.
“The officers contacted the resident in the apartment unit; while speaking with the resident, a large dog was by her side barking at the officers,” the statement read. “The officers asked her to secure the dog, and the resident closed her door momentarily. She re-opened the door, and the dog exited the apartment.”
LAPD said officers shot the dog when it charged at one of them.
In the video, neighbors can be heard angrily admonishing police officers for killing the dog while the woman, identified as Marie Marseille, held the animal, crying.
Marseille could not immediately be reached for comment.
In a phone interview with The Times, the dog owner’s sister, Vanessa Marseille, said the family was shocked and devastated over the shooting death of the dog, Jameson.
“We just don’t know why it happened,” she said. “What’s more scary is that those shots could have hit her or anyone. It was reckless.”
Marseille said her sister told her that she was closing the door when Jameson got out and was shot multiple times.
“It’s just tragic,” she said.
Marseille said her sister was born and raised in New York and left for California in 2014 for work.
Two years ago, she said, her sister purchased Jameson.
“He was the oldest of seven puppies,” Vanessa said, recalling. “He’s quiet and energetic.”
Vanessa said the dog was always with her sister or nephew.
“Every time on FaceTime with Jeremiah, he’s always walking the dog,” she said. “When he takes my sister to work, Jameson is in the car, wagging his tongue.”
At home, she said, her sister and Jameson had their own routine.
“Before he eats his food, they pray together,” she said. “That was her second son.”
The Los Angeles Police Department said no officers were hurt in the incident, and the Force Investigation Division is investigating the shooting.
News
In Alabama, Opposition to Renewable Solar Energy Joins a Data Center Battle
Tuesday’s runoff for a slot on the Alabama Public Service Commission has a familiar ring to it, with talk of data centers and electricity costs. But in a southern twist, solar power has joined the list of villains.
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New Study Assesses Titan’s Resources and their Potential Uses
Saturn’s largest moon, Titan, is a unique environment in our Solar System. It is the only moon (or body beyond Earth) to have a dense, nitrogen-rich atmosphere, and its methane cycle is very similar to Earth’s hydrological cycle, in which solid and liquid methane evaporates to form clouds and returns to the surface as precipitation. In addition, its prebiotic surface environment and rich organic chemistry make it a prime destination for astrobiology missions, such as NASA’s Dragonfly mission (set to launch no earlier than July 2028).
And as Robert Zubrin said in his book, Entering Space: Creating a Spacefaring Civilization, Saturn’s moons could become the “Persian Gulf” of the Solar System, with Titan being a major one because of its rich resource environment. In a recent NASA-supported study, a team of researchers compiled an inventory of Titan’s resources and their potential use by future generations of humans. When comparing this satellite to other destinations (i.e., the Moon and Mars), they conclude that Titan offers several potential benefits for human settlement.
The research was led by Conor A. Nixon, an astronomer and planetary scientist with the Solar System Exploration Division (SSED) at the NASA Goddard Space Flight Center and the Associate Laboratory Chief of their Planetary Systems Laboratory. He was joined by Ye Lu, a Professor of Aerospace Engineering at the Worcester Polytechnic Institute, and Jennifer E. Ruliffson, a Professor of Materials Science and Engineering at the University of Florida. The preprint of their paper has recently appeared online and is under review for publication in *Acta Astronautica*.
Artistic representation of Titan’s abundant resources and their possible uses. Credit: Nixon, C.A. et al (2026)
ISRU is a major aspect in all plans for long-duration missions to the Moon, Mars, and other locations far beyond Earth. To date, the vast majority of studies have focused on leveraging lunar and Martian resources to sustain crewed missions and eventual human settlement. With the exception of a recently proposed Titan ISRU Sample Return (TISR) mission, Titan has received considerably less attention, despite the possibilities this moon offers.
This includes opportunities for ISRU that would enable the construction of long-term habitats on the surface. In addition, they could also lead to Titan becoming a base for resupply missions traveling to and from the outer Solar System. Similarly, Titan could facilitate the exploration of Saturn’s other satellites, particularly the “Ocean Worlds” of Enceladus and Mimas, both of which are also rich in resources. Finally, its resources and products fashioned from them could be exported to other locations in the Solar System.
This includes fuel, feedstock, and basic necessities like food, water, nitrogen fertilizers, oxygen gas, and more. As Nixon told Universe Today via email:
Titan is gushing with hydrocarbons – what we call oil and natural gas on Earth. In the atmosphere, it has about 5% methane (what we call LNG and use in home heating and cooking). On the surface, we can find heavier hydrocarbons, such as propane used in BBQ tanks, butane used in lighters, and heavier liquids like kerosene and gasoline. Besides burning these hydrocarbons, we can also make a lot of products from them: plastics, synthetic rubber, and feedstocks for everything from solvents to pharmaceuticals, and even foods.
The previous study, led by Geoffrey Landis and the Compass Lab team from NASA’s John Glenn Research Center, looked at ISRU at Titan for one purpose: liquifying methane and producing liquid oxygen (LOX) and liquid hydrogen (LH2) from water to create propellant for a sample-return mission. Nixon and his colleagues cast a much wider net, looking further ahead by examining the many possible uses of all of Titan’s resources.
*A rendering of a notional spacecraft powered by nuclear thermal propulsion. Credit: General Atomics*
They also considered how a rich resource base could be used for a wider range of mission profiles. These include missions that need to return to Earth, as well as missions that plan to explore beyond Saturn. To this end, refueling stations on the surface could be accessed by landers from a larger spacecraft that would take on fuel and supplies. Alternately, refueling depots could be built in orbit – similar to what SpaceX is investigating for the Starship – that spacecraft would rendezvous on their way to other destinations.
And as Nixon noted, there’s the possibility of harvesting resources to build long-term settlements on Titan’s surface:
Basically you could envision either ‘refueling’ at Titan (in the manner of the Oleson/Landis study), or using the resources to sustain a more permanent settlement. [And] regarding refueling, it doesn’t just have to be for a return trip to Earth: it could be refueling a ship just arrived from the inner Solar System to go further out, say to Uranus or Neptune, or to explore the Saturnian moons. Or it could just be refueling a regular shuttle that traverses around the Saturn system between colonies on different moons.
Also, we can widen the definition from just ‘fuel’ to resources for a wide variety of purposes. So let’s imagine a permanent station on Titan that refines hydrocarbons and stores them as a variety of feedstocks and raw materials: everything from printer ink to fertilizer. Then, when a visiting ship comes to ‘refuel,’ it is restocking not just fuel but raw ingredients for food, perhaps for 3D printers used to make spare parts, textiles, utensils, and more.
There’s also the large volume of water on Titan, which accounts for 50% of its mass (the rest being rocky material in its core) and exists in both solid and liquid states. The liquid portion exists largely beneath the surface, where ammonia and salinity (two natural antifreeze compounds) maintain its liquid state. Water also exists in abundance as surface ice, which could be harvested and used to provide everything from drinking water to hydrogen fuel, oxygen gas, and (as noted) to manufacture LOX/LH2 propellant.
*This mosaic of Saturn’s moon Enceladus was created with images captured by NASA’s Cassini spacecraft. Credit: NASA/JPL/Space Science Institute*
After considering Titan’s resource base and the opportunities for resupply, settlement, and exploration, Nixon and his colleagues compared Titan with the Moon, Mars, and several NEAs. They determined that while Titan is much more distant and would require nuclear propulsion to enable transits, its potential is unrivaled. “There is simply no other world (that we know of) like Titan,” said Nixon. “Titan is unique in multiple respects: it’s the only moon with an atmosphere, and it’s the only planet/moon other than Earth to have hydrocarbons available in the atmosphere and on the surface.”
While the idea of crewed missions to Titan, or the settlement of this and other Cronian moons, is a far-off prospect, the potential is obvious. By establishing infrastructure and outposts in and around Saturn’s moons, humanity would have access to a huge resource base. Beyond Titan, Saturn’s atmosphere contains massive reserves of the rare isotope helium-3 (³He), considered the ideal fuel for fusion reactors and fusion propulsion. With so much water, hydrocarbons, and precious gases available, Saturn could very well become the “Persian Gulf” of the Solar System.
But as Nixon indicated, the benefits go far beyond refueling and include the means to build a manufacturing base capable of meeting all the needs of a human population. With the abundant plastics, feedstock for 3-D printers, fuel, and food that could be produced in-situ, a human settlement on Titan could endure for generations. It may be a far-off possibility, but it’s good to know that it’s there and could be fulfilled someday as part of humanity becoming an interplanetary civilization.
Further Reading: arXiv
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