With growing concerns over the impact threat of near-Earth small bodies and the utilization of space resources, the orbital evolution of binary asteroid systems has become an important subject in space science. When describing the full two-body dynamics of such systems, the gravitational potential of irregular bodies is determined by both their positions and attitudes, leading to coupling between translational and rotational motions, and the resulting model complexity significantly exceeds that of the classical two-body problem. Although existing numerical methods, such as explicit Runge–Kutta integrators, are widely used, they fail to preserve the symplectic structure and Lie group geometric properties of the system. In long-term simulations, key conserved quantities such as total energy and angular momentum are prone to numerical drift, severely undermining the long-term credibility of orbital predictions. While Lie group variational integrators can preserve geometric structure to a certain extent, their implicit equations are formulated on Lie group elements, which incurs substantial computational overhead. Therefore, how to construct a high-performance integration method that simultaneously achieves numerical accuracy, structure preservation, and computational efficiency has become a core challenge in the long-term evolutionary simulation of binary asteroid systems.

A recent study published in National Science Review, based on Chang'e-6 (CE6) farside samples, has shown that the lunar mantle lacks a clear compositional dichotomy. The farside anorthositic crust is more magnesian, whereas late-stage products of the lunar magma ocean appear thinner on the farside. To reconcile these hemispheric variations spanning from the mantle to the crust, a coherent model of lateral thermal convection within the magma ocean of the tidally-locked Moon has been proposed.

UCF has recruited Melchor Antuñano, one of the nation’s foremost aerospace medicine experts. After decades leading the Federal Aviation Administration’s (FAA) Civil Aerospace Medical Institute, Antuñano joins the College of Medicine as professor, chief technologist and medical innovation officer.

With the rapid development of 6G space–air–ground integrated communication networks, low Earth orbit (LEO) satellite constellations, leveraging their advantages of wide-area coverage and freedom from geographic constraints, have become key infrastructure for achieving global seamless connectivity. However, due to the relative motion among satellites in different orbits, inter-satellite links (ISLs) exhibit periodic dynamic on–off characteristics, among which a portion of the interruptions are predictable topological changes. Conventional Open Shortest Path First (OSPF) protocols compute shortest paths solely based on link distance, without considering link effective duration or bandwidth constraints, rendering them inadequate for adapting to the dynamic topological characteristics of satellite networks. Although fast reroute strategies can address sudden link failures, they consume substantial bandwidth resources and cannot provide protection for all nodes across the entire network. Therefore, how to proactively switch service paths before predictable link interruptions occur, so as to minimize service disruption and resource overhead, has become a core issue in ensuring service continuity in LEO satellite networks.

The near-Earth asteroid Apophis will make an extremely close flyby of Earth on April 13, 2029, at a distance of approximately 38,000 km—an event that occurs on average only once every 7,500 years, offering an unprecedented opportunity for planetary science and planetary defense. However, significant uncertainties remain regarding the physical parameters of Apophis, such as its shape, spin state, internal structure, and material composition, and predictions of tidal effects—including potential orbital changes, spin acceleration, surface material displacement, and dust ejection during the flyby—are highly dependent on model assumptions. Although multiple nations have planned exploration missions, how to coordinate global observational resources within the limited time window, optimize rapid-response mission architectures, and translate scientific understanding into effective planetary defense strategies remain critical challenges to be addressed.

Analysis of 115 NASA photographs from 13 astronauts, published in Eye & ENT Research, showed that spaceflight consistently elevates the lower eyelid, reducing MRD2 (margin reflex distance 2) by a mean of 1.0 mm (p < 0.001). All astronauts exhibited this “reverse ptosis,” with 62% showing a clinically significant change (≥ 1 mm). The effect appears to occur rapidly and persist throughout missions, likely driven by cephalad fluid shift and elastic recoil of facial tissues. The study was retrospective and limited by image quality and lack of symptom data; future research with standardized imaging is needed to explore mechanisms and potential impacts on ocular health during long-duration spaceflight.

With the long-term on-orbit operation of space stations, extravehicular status monitoring and surface inspection tasks have imposed higher demands on the motion planning capabilities of manipulators. Space redundant manipulators, when performing visual monitoring tasks, must simultaneously satisfy multiple complex constraints including kinematics, dynamics, obstacle avoidance, and end-effector line-of-sight, making this a typical nonlinear non-convex optimal control problem. Although sampling-based methods can rapidly generate collision-free paths, they struggle to guarantee dynamic feasibility in high-dimensional systems and often yield poor-quality paths. Optimization-based methods, while capable of directly generating high-quality trajectories, are highly sensitive to initial solutions and lack effective warm-start mechanisms. Therefore, how to merge the rapid search capability of sampling-based methods with the precise solving advantage of optimization-based methods to plan high-quality executable trajectories under complex constraints for space manipulators has become a key challenge in advancing the intelligent development of space robotics.

The University of Hong Kong (HKU) has successfully secured the hosting rights for the 2028 Magnetospheres of Outer Planets (MOP) Conference. As the premier global symposium in space physics, MOP has been held biennially since the 1970s and will make its historic debut in Hong Kong in 2028, more than half a century after its inception. Jointly hosted by the Hong Kong Institute for Astronomy and Astrophysics (HKIAA) and the Laboratory for Space Research (LSR) at HKU, this landmark event marks a major milestone in establishing Hong Kong’s leadership in space and planetary sciences across the Asia-Pacific region and globally.

Some stars that survive repeated close encounters with supermassive black holes produce flares that mysteriously grow dimmer each time — and Syracuse University astrophysicists have now traced the reason to the star's own spin.