Kyoto, Japan --  "Why are we here?" is humanity's most fundamental and persistent question. Tracing the origins of the elements is a direct attempt to answer this at its deepest level. We know many elements are created inside stars and supernovae, which then cast them out into the universe, yet the origins of some key elements has remained a mystery.

Chlorine and potassium, both odd-Z elements -- possessing an odd number of protons -- are essential to life and planet formation. According to current theoretical models, stars produce only about one-tenth the amount of these elements observed in the universe, a discrepancy that has long puzzled astrophysicists.

This inspired a group of researchers at Kyoto University and Meiji University to examine supernova remnants for traces of these elements. Using XRISM -- short for X-Ray Imaging and Spectroscopy Mission, an X-ray satellite launched by JAXA in 2023 -- the team was able to perform high-resolution X-ray spectroscopic observations of the Cassiopeia A supernova remnant within the Milky Way.

LimbNET, a new open-access and user-friendly platform from EMBL Barcelona, enables scientists to simulate how gene networks pattern the embryonic limb as it develops, integrating data on gene expression over time and space with live 2D modelling. By centralising models and simulations, LimbNET aims to foster collaboration, transparency, and cumulative knowledge-building within the global limb development community. The platform represents a new mode of scientific publishing by allowing researchers to share fully interactive models – data, equations, and simulations – through a single integrated portal, promoting reproducibility and engagement with published research.

Tigers don’t roam across Asia as they used to, but on one island in Indonesia a population of critically endangered Sumatran tigers may have found a habitat that supplies them with enough space, intact forests, and prey to thrive and raise their young. To examine tiger population densities, researchers working alongside local rangers installed infrared cameras in forests outside the national park system. Their work, in collaboration with the government of Aceh province, resulted in almost three times more images being taken and individual tigers being identified than during previous surveys. Dedicated protection efforts are the main reason for tigers’ persistence in this ecosystem, which highlights the necessity of such measures, the team said.

Researchers from Zhejiang Lab have proposed a novel spatiotemporal mode multiplexing technology, coupling pulsed orbital angular momentum (OAM) beams with diffractive deep neural networks (D²NN) and optical fiber delay-line arrays to realize a “space-time” projection mechanism. This enables high-speed, all-optical multidimensional multiplexing with potential scalability to the GHz level, offering a breakthrough solution for large-capacity optical communications in challenging environments such as free space and underwater.

Astronomers using the Subaru Telescope in Hawaiʻi have discovered a massive planet and a brown dwarf orbiting distant stars. The discoveries are the first results from OASIS (Observing Accelerators with SCExAO Imaging Survey), which combines space-based measurements with the Subaru Telescope’s advanced imaging to find hidden worlds. These discoveries in turn enable NASA’s upcoming Roman Space Telescope to test critical technologies for imaging Earth-like planets.

An international team led by the University of Oxford has identified one of the largest rotating structures ever reported: a “razor-thin” string of galaxies embedded in a giant spinning cosmic filament, 140 million light-years away. The findings, published today (4 December) in Monthly Notices of the Royal Astronomical Society, could offer valuable new insights into how galaxies formed in the early Universe.