Advanced Orbital Constellations for Solar Storm Defense Solar storms have the potential to cause catastrophic damage. One that occurred around the end of October 2003 (now called the 2003 Halloween Storm) caused an estimated $27B in damages. That number will only increase as humanity has become more reliant on space-based and electrical infrastructure. However, if we could predict when storms would hit with some accuracy and adjust our use of the technologies that could be affected, we could avoid the worst damage. But, as of now, we don’t have such a system that could help predict the types of events that could cause that damageRead More →

Advancing Deep Space Travel with Nuclear Propulsion How can fission-powered propulsion help advance deep space exploration, specifically to the outer planets like Jupiter, Saturn, Uranus, and Neptune? This is what a recent study presented at the 56th Lunar and Planetary Science Conference (LPSC) hopes to address as a pair of researchers from India investigated the financial, logistical, and reliability of using fission power for future deep space missions. This study has the potential to help scientists, engineers, and future astronauts develop next-generation technologies as humanity continues to expand its presence in space. Universe Today Go to SourceRead More →

Astronomers discover new evidence of intermediate-mass black holes In the world of black holes, there are generally three size categories: stellar-mass black holes (about five to 50 times the mass of the sun), supermassive black holes (millions to billions of times the mass of the sun), and intermediate-mass black holes with masses somewhere in between. phys.org Go to SourceRead More →

June’s Full Moon is the Southernmost for a Generation Not all Full Moons are created the same. Follow the familiar Moon long enough, and you’ll notice something strange, as it seems to wander across the sky from north to south, from one cycle to the next. Welcome to the fantastic precession of our natural satellite the Moon. Last December, we saw the ‘Long Night’s Full Moon,’ as the Full Moon nearest to the solstice rode the highest in the sky for the last two decades. Now, its time for the southern hemisphere to get a turn, as the Moon heads steeply southward, on its wayRead More →

The Habitability of Earth Tells Us the Likelihood of Finding Life Elsewhere In a universe of a billion galaxies, Earth is the world known to have life. If we’re a common example of what happens in the Universe, then our location can tell us something about habitability. A new study is about to flip everything we thought we knew about habitability on its head, examining the potential for life in exotic environments, such as rogue planets, water worlds, and tidally locked planets, and calculate how habitable they would be compared to Earth. As we learn more about these other worlds, if they are more habitable,Read More →

Webb Reveals that Europa’s Surface is Constantly Changing You’d think that icy worlds are frozen in time and space because they’re – well – icy. However, planetary scientists know that all worlds can and do change, no matter how long it takes. That’s true for Europa, one of Jupiter’s four largest moons. Recent observations made by the James Webb Space Telescope (JWST) zero in on the Europan surface ices and show they’re constantly changing. Universe Today Go to SourceRead More →

On the Probability of the Initial Conditions for Inflation and Slow Contraction Mark P. Hertzberg, Daniel Jim’enez-Aguilar arXiv:2505.22763v1 Announce Type: cross Abstract: Some recent studies based on numerical relativity simulations claim that slow contraction/ekpyrosis is strongly preferred over inflation as the smoothing mechanism that brought the universe into the homogeneous, isotropic and flat state we observe today on large scales. In this paper, we evaluate the likelihood of the initial conditions employed in the aforementioned simulations by estimating the probability that a free scalar field dominating the universe at the beginning of inflation or ekpyrosis will be sufficiently homogeneous on scales comparable to the HubbleRead More →

Kinetically Modified Palatini Inflation Meets ACT Data C. Pallis arXiv:2505.23243v1 Announce Type: cross Abstract: We show that the coexistence of a non-minimal coupling to gravity fR=1+cR phi^(n/2) with a kinetic mixing of the form fk=fR^m — where n=2 and 4 and 0.5arXiv:2505.23243v1 Announce Type: cross Abstract: We show that the coexistence of a non-minimal coupling to gravity fR=1+cR phi^(n/2) with a kinetic mixing of the form fk=fR^m — where n=2 and 4 and 0.5Read More →

Carbon-rich dust injected into the interstellar medium by Galactic WC binaries survives for hundreds of years Noel D. Richardson, Micaela Henson, Emma P. Lieb, Corey Kehl, Ryan M. Lau, Peredur M. Williams, Michael F. Corcoran, J. R. Callingham, Andr’e-Nicolas Chen’e, Theodore R. Gull, Kenji Hamaguchi, Yinuo Han, Matthew J. Hankins, Grant M. Hill, Jennifer L. Hoffman, Jonathan Mackey, Anthony F. J. Moffat, Benjamin J. S. Pope, Pragati Pradhan, Christopher M. P. Russell, Andreas A. C. Sander, Nicole St-Louis, Ian R. Stevens, Peter Tuthill, Gerd Weigelt, Ryan M. T. White arXiv:2505.11616v2 Announce Type: replace Abstract: Some carbon-rich Wolf-Rayet stars (WC stars) show an infrared excess fromRead More →

Is leptogenesis during gravitational reheating flavourful? Basabendu Barman, Arghyajit Datta, Md Riajul Haque arXiv:2410.16381v2 Announce Type: replace-cross Abstract: We examine the impact of charged lepton Yukawa equilibration on leptogenesis during gravitational reheating. During the post-inflationary era, the inflaton field is assumed to oscillate around the minimum of a monomial potential, leading to the gravitational production of Standard Model (SM) particles, constituting the radiation bath. The heavy right-handed neutrinos (RHN), responsible for generating baryon asymmetry via leptogenesis, are also produced through graviton-mediated scattering of the homogeneous inflaton field and thermal bath, as well as from the the inverse decay of the bath particles. By considering bothRead More →

The Spin-Orbit Alignment of 8 Warm Gas Giant Systems Juan I. Espinoza-Retamal, Andr’es Jord’an, Rafael Brahm, Cristobal Petrovich, Elyar Sedaghati, Gu{dh}mundur Stef’ansson, Melissa J. Hobson, Marcelo Tala Pinto, Diego J. Mu~noz, Gavin Boyle, Rodrigo Leiva, Vincent Suc arXiv:2412.08692v2 Announce Type: replace Abstract: Essential information about the formation and evolution of planetary systems can be found in their architectures — in particular, in stellar obliquity ($psi$) — as they serve as a signature of their dynamical evolution. Here, we present ESPRESSO observations of the Rossiter-Mclaughlin (RM) effect of 8 warm gas giants, revealing that independent of the eccentricities, all of them have relatively aligned orbits. OurRead More →

The Search is on for Betel-Buddy Betelgeuse is dying—but not quietly. This colossal red supergiant, already famous for its brightness fluctuations, has now revealed a strange long-term rhythm: a secondary pulse every 2,100 days. One tantalising theory suggests a hidden companion—possibly a second star orbiting Betelgeuse at roughly the distance between Saturn and the Sun, circling every six years. Astronomers recently pointed the Hubble Space Telescope at the giant in search of this elusive “Betel-Buddy” but failed to find it constraining its size and orbit. Universe Today Go to SourceRead More →

Martian Probe Rolls Over to See Subsurface Ice and Rock NASA’s Mars Reconnaissance Orbiter is equipped with a powerful tool called SHARAD (Shallow Radar), designed to peer beneath the Martian surface and uncover hidden layers of ice, rock, and geological secrets. To accommodate it, engineers mounted SHARAD on the side of the spacecraft, requiring the orbiter to roll 28° during operation to boost signal quality. But computer models hinted at something else: if the orbiter rolled more than 120°, the radar performance could dramatically improve. Scientists put this daring idea to the test—and it paid off. The extreme roll manoeuvre worked, unlocking an even clearerRead More →

Did a Large Impact on the Moon Make its Rocks Magnetic? We’ve been gazing at the Moon for a long time, yet it’s still mysterious. We’ve sent numerous orbiters and landers to our satellite, and even brought some of it back to our labs. Those rocks only presented more mysteries, in some ways. Lunar rocks are magnetic, yet the Moon doesn’t have a magnetosphere. How did this happen? Universe Today Go to SourceRead More →

The Challenge Of Coordinating Multiple Robots On The Moon Frameworks are a critical, if underappreciated, component of any space exploration mission. They can range from the overall mission architecture, capturing scientific and technical goals, to the structure of messages sent between two internal components of the system. One of the most interesting frameworks that is getting much attention in the space exploration community is the interaction of multiple robots for a single purpose, known as a multiple-robot system, or MRS. On top of that, one of the most common frameworks for robots on Earth or in space is the open-source Robot Operating System (ROS), whichRead More →

How to Handle Resource Waste from ISRU on the Moon In-situ resource utilization (ISRU) is commonly cited as being a critical step towards a sustainable human presence in space, especially on the Moon. Just how crucial it is, and how much its by-products will affect other uses of the Moon, is still up for debate. A new paper from Evangelia Gkaravela and Hao Chen of the Stevens Institute of Technology dives into those questions and comes up with a promising answer – ISRU is absolutely worth it, if we can control the waste products. Universe Today Go to SourceRead More →

Venus Shows Why Ozone Isn’t a Good Biosignature Just because we can find ozone in the atmosphere of other planets doesn’t mean there’s life. Ozone is a sign of life on Earth, but its detection on Venus shows that it can also be produced abiotically. This indicates that there are different pathways for its creation, not only on Venus but also on other Venus-like exoplanets. Universe Today Go to SourceRead More →

The Biggest Ideas in the Universe – Quanta and Fields What happens when you see something that just doesn’t make sense? Perhaps you rub your eyes and consider it an anomaly. But what if you see it in an experiment? Say, travelling electrons that make different patterns depending upon whether they were detected? Then, you might want to change your sense of reality. Now, if you can develop a theory for the observations, then maybe you can start a new field of science. It has happened. Quantum mechanics is the name given to this relatively new field and it’s the topic that Sean Carroll writesRead More →