For the first time, astronomers using the Hubble Space Telescope have spotted a pair of catastrophic collisions in another solar system. They were observing Fomalhaut, a bright star about 25 light-years away, and detected a pair of planetesimal collisions and their light-reflecting dust clouds. The system is young, and the collisions reflect what our Solar System was like when it was young.

Ask someone on Earth for the time and they can give you an exact answer, thanks to our planet's intricate timekeeping system, built with atomic clocks, GPS satellites and high-speed telecommunications networks. Ask for the time on Mars and the answer gets much more complicated.

Getting close to things is one way for scientists to collect better data about them. But that's been hard to do for the Sun, since getting close to it typically entails getting burnt to a crisp. Just ask Icarus. But if Icarus had survived his close encounter with the Sun, he might have been able to see massive magnetic “tadpoles” tens of thousands of kilometers wide reconnecting back down to the surface of our star. Or maybe not, because he had human eyes, not the exceptionally sensitive Wide-Field imagers the Parker Solar Probe used to look at the Sun while it made its closest ever pass to our closest star. A new paper in The Astrophysical Journal Letters from Angelos Vourlidas of Johns Hopkins University’s Applied Physics Laboratory and his co-authors describes what they say on humanity’s closest brush with the Sun so far.

In a new paper, a team of researchers explores how non-human species (in this case, fireflies) could inform new approaches in the Search for Extraterrestrial Intelligence (SETI).

Astronomers may have just seen the first ever ‘superkilonova,’ a combination of a supernova and a kilonova. These are two very different kinds of stellar explosions, and if this discovery stands, it could change the way scientists understand stellar birth and death.

In 2024, astronomers discovered the brightest Luminous Fast Blue Optical Transient (LFBOT) ever observed. LFBOTs are extremely bright flashes of blue light that shine for brief periods before fading away. New analysis of this record-breaking burst, which includes observations from the International Gemini Observatory, funded in part by the U.S. National Science Foundation, challenges all prior understanding of these rare explosive events.

In a glimpse of the early universe, astronomers have observed a galaxy as it appeared just 800 million years after the Big Bang – a cosmic Jekyll and Hyde that looks like any other galaxy when viewed in visible and even ultraviolet light but transforms into a cosmic beast when observed at infrared wavelengths. This object, dubbed Virgil, is forcing astronomers to reconsider their understanding of how supermassive black holes grew in the infant universe.

With new technologies comes new discoveries. Or so Spider Man’s Uncle Ben might have said if he was an astronomer. Or a scientist more generally - but in astronomy that saying is more true than many other disciplines, as many discoveries are entirely dependent on the technology - the telescope, imager, or processing algorithm, used to collect data on them. A new piece of technology, the Nancy Grace Roman Space Telescope, is exciting scientists enough that they are even starting to predict what kind of discoveries it might make. One such type of discovery, described in a pre-print paper on arXiv by Vito Saggese of the Italian National Institute for Astrophysics and his co-authors on the Roman Galactic Exoplanet Survey Project Infrastructure Team, is the discovery of many more multiplantery exoplanet systems an astronomical phenomena Roman is well placed to detect - microlensing.

Gemini North captured new images of Comet 3I/ATLAS after it reemerged from behind the Sun on its path out of the Solar System. The data were collected during a Shadow the Scientists session — a unique outreach initiative that invites students around the world to join researchers as they observe the Universe on the world’s most advanced telescopes.

Everyone’s favorite interstellar comet posed for one more portrait recently. The European Space Agency’s XMM-Newton mission nabbed 3I/ATLAS on December 3rd from about 283 million kilometers distant. This comes as the comet is set to make its closest passage versus Earth this coming Friday, on December 19th.

In astronomy, there is a concept called “degeneracy”. It has nothing to do with delinquent people, but instead is used to describe data that could be interpreted multiple ways. In some cases, that interpretation is translated into exciting new possibilities. But many times, when that happens, other, more mundane explanations are ignored for the publicity that the more interesting possibilities provide. That seems to have been the case for many “sub-Neptune” exoplanets discovered recently. Some theories have described them as Hycean worlds - worlds that are filled with water oceans or ice. But a new paper from Robb Calder of the University of Cambridge and his co-authors shows that, most likely, these planets are almost all made of molten lava instead.

When we gaze up at the night sky, we assume that what we're seeing is a representative population of similar stars at similar distances. But it's not. The stars we see are a mixture of massive and small, distant and near. In fact, we can't even see our closest neighbour, Proxima Centauri. We see these stars because they have large observational signals, and that illustrates one of the problems in astronomy.

The Large-Scale Structure of the Universe features massive filaments where galaxy clusters and superclusters reside. In between these filaments are cosmic voids, vast regions that are nearly empty. The Nancy Grace Roman will map and study 80,000 of these voids to place constraints on Dark Energy drives the expansion of the Universe.

If you read enough articles about planets in binary star systems, you’ll realize almost all of them make some sort of reference to Tatooine, the fictional home of Luke Skywalker (and Darth Vader) in the Star War saga. Since that obligatory reference is now out of the way, we can talk about the new “super-Jupiter” that researchers from two separate research teams, including one at Northwestern University and one at the University of Exeter, simultaneously found in old data from the Gemini Planet Imager (GPI).

The Shenzhou-21 crew on board China's orbiting space station completed its first extravehicular activities on Tuesday, Dec. 9th, during which they validated the new EVA spacesuits.

A team of researchers from the University of Zurich and the NCCR PlanetS is challenging our understanding of the interior of the Solar System's planets. The composition of Uranus and Neptune, the two outermost planets, might be more rocky and less icy than previously thought.

For roughly two billion years of Earth’s early history, the atmosphere contained no oxygen, the essential ingredient required for complex life. Oxygen began building up in the atmosphere during the period known as the Great Oxidation Event (GOE), but it had to enter the oceans first. When and how it first entered the oceans has remained uncertain.

Scientists have discovered a crucial clue to understanding one of nature's most spectacular light shows, the aurora. Research from the University of Southampton reveals that just before these magnetospheric substorms erupt, a distinct pattern of low frequency radio waves appears above the aurora, radio emissions that surge in strength precisely as mysterious "auroral beads" transform into full storms. This radio signature, detected by spacecraft and ground observatories across multiple events, provides the first direct evidence of the physical processes triggering these dramatic celestial displays, and may explain similar phenomena occurring in the magnetospheres of Jupiter and Saturn.

Scientists at Southwest Research Institute have opened a new laboratory dedicated to answering one of astronomy's most fundamental questions, where do planets come from? The Nebular Origins of the Universe Research (NOUR) Laboratory will recreate the extreme conditions found in interstellar clouds, vast regions of ice, gas, and dust that existed before our Solar System formed to trace how these primordial materials ultimately evolved into the worlds we see today. By simulating the chemistry of pre-planetary environments in specialised vacuum chambers, researchers aim to understand how the building blocks of life, including the components of DNA and RNA, formed in the darkness of space billions of years ago.

A “House of Cards” is a wonderful English phrase that it seems is now primarily associated with a Netflix political drama. However, its original meaning is of a system that is fundamentally unstable. It’s also the term Sarah Thiele, originally a PhD student at the University of British Columbia, and now at Princeton, and her co-authors used to describe our current satellite mega-constellation system in a new paper available in pre-print on arXiv.