Our galaxy’s supermassive black hole is famous for being one of the dimmest in the universe. Evidence from a new space telescope shows that might not always have been the case. Sagittarius A*, located at the center of the Milky Way Galaxy, appears to have flared dramatically sometime within the past few hundred to 1,000 years, according to X-ray emissions observed by the XRISM space telescope. These surprising findings unveil new details of how supermassive black holes evolve. They also teach astronomers lessons about the history of our cosmic home.

Acute sepsis profoundly changes how intravenous fluids behave within the body. Using a sheep model, researchers investigated fluid distribution during health and sepsis following crystalloid infusion. They found that sepsis reduced urine output, impaired vascular responsiveness, and diverted most infused fluid into a nonfunctional interstitial third space. These alterations explain why standard fluid therapy becomes less effective during sepsis and underscore challenges in managing circulation and organ perfusion clinically safely.

Organised by the Beijing-Hong Kong Academic Exchange Centre, the results of the annual selection for the ‘Top 10 Innovation & Technology News in Hong Kong 2025’, have recently been announced. The University of Hong Kong (HKU) is pleased to report that three of its groundbreaking research projects have made it onto this prestigious list, leading among all local institutions. These selected projects in the fields of medical health and astronomical sciences highlight HKU's strong capabilities in advanced translational research and technology transfer. The university aims to address global challenges and deliver impactful real-world solutions, all while striving to benefit society and support sustainable development.  

Astronomers have found something the universe wasn’t supposed to have: a galaxy cluster blazing with hot gas just 1.4 billion years after the Big Bang, far earlier and hotter than theory predicts. The result, published today in Nature, could upend current models of galaxy cluster formation, which predict such temperatures occur only in more mature, stable galaxy clusters later in the universe’s life.

Rice researchers found thin ice may have protected lake water on frozen Mars

Researchers able to track for the first time how a particularly active region of the sun develops over three solar rotations using two space probes.

Such observations help to better predict space weather.

The super -active region triggered the strongest solar storm observed in the last twenty years in May 2024.

Solar storms have the potential to cause significant disruption to modern technologies, including navigation, communication, and power systems.