Much remains to be known about the chemical composition of small asteroids. Their potential to harbour valuable metals, materials from the early solar system, and the possibility of obtaining a geochemical record of their parent bodies makes them promising candidates for future use of space resources. A team led by the Institute of Space Sciences (ICE-CSIC) has analyzed samples of C-type asteroids, carbon-rich minor bodies of the Solar System, progenitors of the carbonaceous chondrites. Their findings, published in the Monthly Notices of the Royal Astronomical Society, support the idea that these asteroids can serve as crucial material sources and identify their parent bodies, as well as for planning future missions and developing new technologies for resource exploitation.

Photocatalytic seawater splitting is an attractive way for producing green hydrogen. Significant progresses have been made recently in catalytic efficiencies, but the activity of catalysts can only maintain stable for about 10 h. Here, we develop a vacancy-engineered Ag₃PO₄/CdS porous microreactor chip photocatalyst, operating in seawater with a performance stability exceeding 300 h. This is achieved by the establishment of both catalytic selectivity for impurity ions and tailored interactions between vacancies and sulfur species. Efficient transport of carriers with strong redox ability is ensured by forming a heterojunction within a space charge region, where the visualization of potential distribution confirms the key design concept of our chip. Moreover, the separation of oxidation and reduction reactions in space inhibits the reverse recombination, making the chip capable of working at atmospheric pressure. Consequently, in the presence of Pt co-catalysts, a high solar-to-hydrogen efficiency of 0.81% can be achieved in the whole durability test. When using a fully solar-driven 256 cm² hydrogen production prototype, a H₂ evolution rate of 68.01 mmol h⁻¹ m⁻² can be achieved under outdoor insolation. Our findings provide a novel approach to achieve high selectivity, and demonstrate an efficient and scalable prototype suitable for practical solar H₂ production.

University of Arizona astronomers discover a galaxy with a dual personality – appearing ordinary in visible light while appearing to accrete material at an extraordinary rate when observed in the infrared. Captured as it appeared just 800 million years after the Big Bang, the galaxy revealed an outsized black hole that calls into question prevailing theories about galaxies and their host galaxies growing together. 

WASHINGTON, D.C. – The U.S. Naval Research Laboratory (NRL) Spacecraft Engineering Department recently developed the Transmit/Receive Enterprise (TREx) service with sponsorship from the Space Development Agency, Space Rapid Capabilities Office, and Space Systems Command to provide software development and mission operations for sponsoring organizations across the space community.

Conventional telescopes are limited in detecting low-surface-brightness (LSB) structures, which are essential for studying galaxy evolution. Now, researchers have developed a new telescope system featuring a confocal off-axis design with three freeform mirrors, optimized for deep LSB imaging. This system enables astronomers to observe faint galactic features more clearly, revealing how galaxies evolve over time.