There’s a Way to Make Ringworlds and Dyson Spheres Stable

Artist's illustration of a dyson sphere

The idea of Dyson Sphere’s has been around for decades. When Freeman Dyson explored the concept he acknowledged that they may not be a physical sphere but could be a swarm of satellites in a spherical configuration around a star. The challenge with a solid sphere is that its orbit will not be stable leading to its destruction. A new paper casts a new view on that though and proposes a way that a rigid sphere could be stable after all. The idea suggests that a binary star system, where the mass ratio between the two objects is small, the sphere may be stable. 

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Water Arrived in the Final Stages of Earth's Formation

Artist concept of Earth during the Late Heavy Bombardment period. Credit: NASA's Goddard Space Flight Center Conceptual Image Lab.

Roughly 4.6 billion years ago, the Sun was born from the gas and dust of a nebula that underwent gravitational collapse. The remaining gas and dust settled into a protoplanetary disk that slowly accreted to form the planets, including Earth. About 4.5 billion years ago, our planet was impacted by a Mars-sized body (Theia), which led to the formation of the Moon. According to current theories, water was introduced to Earth and the inner planets by asteroids and comets that permeated the early Solar System.

The timing of this event is of major importance since the introduction of water was key to the origin of life on Earth. Exactly when this event occurred has been a mystery for some time, but astronomers generally thought it had arrived early during Earth’s formation. According to a recent study by a team led by scientists from the University of Rutgers-New Brunswick, water may have arrived near “late accretion” – the final stages of Earth’s formation. These findings could seriously affect our understanding of when life first emerged on Earth.

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An Amazing JWST Image of a Protostar

Herbig-Haro 30. Credit: JWST
Herbig-Haro 30. Credit: JWST

The James Webb Space Telescope (JWST) has been giving us a fabulous new view on the universe since its launch. This new image of the protostar HH30 is in amazing new detail thanks to the JWST. It was first discovered using the Hubble Space Telescope but this Herbig-Haro object, which is a dark molecular cloud, is a perfect object for JWST. The image shows the protoplanetary disk seen edge on with a conical outflow of gas and dust with a narrow jet blasting out into space.

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There Could Be a Supermassive Black Hole in the Large Magellanic Cloud Hurling Stars at the Milky Way

This beautiful image shows the Large and Small Magellanic Cloud above the ESO's Paranal Observatory and the four Auxiliary Telescopes of the Very Large Telescope (VLT) Array. New research shows that the LMC may harbour a supermassive black hole that's responsible for some of the Milky Way's hypervelocity stars. Image Credit: By ESO/J. Colosimo - http://www.eso.org/public/images/potw1511a/, CC BY 4.0, https://commons.wikimedia.org/w/index.php?curid=38973313

Hypervelocity stars (HVSs) were first theorized to exist in the late 1980s. In 2005, the first discoveries were confirmed. HVSs travel much faster than normal stars, and sometimes, they can exceed the galactic escape velocity. Astronomers estimate that the Milky Way contains about 1,000 HVSs, and new research shows that some of these originate in the Milky Way’s satellite galaxy, the Large Magellanic Cloud (LMC).

Does the LMC have a supermassive black hole (SMBH) that’s ejecting some HVSs into the Milky Way?

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Uranus’ Moon Ariel has Deep Gashes, Could Reveal its Interior

Voyager 2 captured this image of Uranus' moon Ariel in 1986 from 130,000 km away. New research based largely on this image hints at the nature of the moon's interior. Image Credit: By NASA/JPL - https://www.jpl.nasa.gov/images/pia00037-ariel-at-voyager-closest-approach, Public Domain, https://commons.wikimedia.org/w/index.php?curid=1110562

We’ve only gotten one close-up view of Uranus and its moons, and it happened decades ago. In 1986, Voyager 2 performed a flyby of Uranus from about 81,500 km (50,600 mi) of the planet’s cloud tops. It was 130,000 km (80,000 mi) away from Uranus’ moon, Ariel, when it captured the leading image. It showed some unusual features that scientists are still puzzling over.

What do they reveal about the moon’s interior?

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A Recent Impact on Mars Shook the Planet to Its Mantle

New research suggests an impact recently rattled Mars deeper than thought.

Hirise
HiRISE images a recent impact crater in the Cerberus Fossae region, seen on March 4, 2021. Credit: NASA/MRO/HiRISE

Something really rang the Red Planet’s bell. Research involving two NASA missions—the Mars Reconnaissance Orbiter, and the late InSight lander—has shed light on meteorite impacts and the seismic signals they produce. In a crucial finding, these signals may penetrate deeper inside Mars than previously thought. This could change how we view the interior of Mars itself.

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This Hot Jupiter Probably Formed Close to Its Star

This artist's illustration shows an alien world that is losing magnesium and iron gas from its atmosphere. The observations represent the first time that so-called "heavy metals"—elements more massive than hydrogen and helium—have been detected escaping from a hot Jupiter, a large gaseous exoplanet orbiting very close to its star. The planet, known as WASP-121b, orbits a star brighter and hotter than the Sun. Image Credit: NASA, ESA, and J. Olmsted (STScI)

The current exoplanet census contains 5,832 confirmed candidates, with more than 7,500 still awaiting confirmation. Of those that have been confirmed, most have been gas giants ranging from Neptune-like bodies (1992) to those similar to or many times the size and mass of Jupiter and Saturn (1883). Like the gas giants of the Solar System, astronomers generally theorized that these types of planets form in the outer reaches of their star system, where conditions are cold enough for gases like hydrogen and helium and volatile compounds (water, ammonia, methane, etc.) will condense or freeze solid.

However, astronomers have noted that many of the gas giants they’ve observed orbited close to their stars, known as “Hot Jupiters.” This has raised questions about whether or not gas giants and other planets migrate after formation until they find their long-term, stable orbits. In a new study, a team from Arizona State University’s School Of Earth and Space Exploration (ASU-SESE) examined the atmospheric chemistry of several Hot and Ultra-Hot Jupiters. After examining WASP-121b, the team came to the unexpected conclusion that it likely formed close to its star.

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Astronomers Find the Largest Structure in the Universe and Name it “Quipu”

This image shows five newly-discovered superstructures. Quipu (red) is the largest structure ever found in the Universe. The others are Shapley (blue), Serpens-Corona Borealis (green), Hercules (purple) and Sculptor-Pegasus (beige). Image Credit: Bohringer et al. 2025.

Is it possible to understand the Universe without understanding the largest structures that reside in it? In principle, not likely. In practical terms? Definitely not. Extremely large objects can distort our understanding of the cosmos.

Astronomers have found the largest structure in the Universe so far, named Quipu after an Incan measuring system. It contains a shocking 200 quadrillion solar masses.

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Hybrid Gas/Drill Asteroid Sampler Could Improve Collection Amounts

Asteroid sampling missions are getting increasingly complex. Recent announcements about the existence of amino acids in the sample OSIRIS-REx returned from Bennu in 2023 will likely result in more interest in studying the small bodies strewn throughout our solar system. Engineering challenges abound when doing so, though, including one of the most important – how to collect a sample from the asteroid. A new paper from researchers at the China Academy of Space Technology looks at a gas-drive sample system they believe could hold the key to China’s future asteroid sample return mission.

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Bullseye! Hubble Spots Ripples in Space From a Galaxy Collision

Hubble view of Bullseye Galaxy
NASA's Hubble Space Telescope captured this view of the Bullseye Galaxy. Credit: NASA, ESA, Imad Pasha (Yale), Pieter van Dokkum (Yale)

What happens when one galaxy shoots a bigger galaxy right through the heart? Like a rock thrown into a pond, the smashup creates a splash-up of starry ripples. At least that’s what happened to the Bullseye galaxy, which is the focus of observations made by NASA’s Hubble Space Telescope and the Keck Observatory in Hawaii.

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