WASHINGTON, D.C. – The U.S. Naval Research Laboratory (NRL), in partnership with and with funding support from the Defense Advanced Research Projects Agency (DARPA) and Northrop Grumman’s SpaceLogistics, has reached a historic milestone in satellite servicing technology, completing on Sept. 5 a critical round of space-readiness testing on a robotic spacecraft designed to extend and upgrade satellites already in orbit.

In our nearby stellar neighborhood, a burned-out star is snacking on a fragment of a Pluto-like object. With its unique ultraviolet capability, only NASA’s Hubble Space Telescope could identify that this meal is taking place.

The stellar remnant is a white dwarf about half the mass of our Sun, but that is densely packed into a body about the size of Earth. Scientists think the dwarf’s immense gravity pulled in and tore apart an icy Pluto analog from the system’s own version of the Kuiper Belt, an icy ring of debris that encircles our solar system. The findings were reported on September 18 in the Monthly Notices of the Royal Astronomical Society.

Radiative cooling is a passive thermal management strategy that leverages the natural ability of materials to dissipate heat through infrared radiation. It has significant implications for energy efficiency, climate adaptation, and sustainable technology development, with applications in personal thermal management, building temperature regulation, and aerospace engineering. However, radiative cooling performance is susceptible to environmental aging and special environmental conditions, limiting its applicability in extreme environments. Herein, a critical review of extreme environmental radiative cooling is presented, focusing on enhancing environmental durability and cooling efficiency. This review first introduces the design principles of heat exchange channels, which are tailored based on the thermal flow equilibrium to optimize radiative cooling capacity in various extreme environments. Subsequently, recent advancements in radiative cooling materials and micro-nano structures that align with these principles are systematically discussed, with a focus on their implementation in terrestrial dwelling environments, terrestrial extreme environments, aeronautical environments, and space environments. Moreover, this review evaluates the cooling effects and anti-environmental abilities of extreme radiative cooling devices. Lastly, key challenges hindering the development of radiative cooling devices for extreme environmental applications are outlined, and potential strategies to overcome these limitations are proposed, aiming to prompt their future commercialization.

Astronomers have used observatories around the world, including the European Southern Observatory's Very Large Telescope (ESO’s VLT), to study the asteroid 1998 KY26, revealing it to be almost three times smaller and spinning much faster than previously thought. The asteroid is the 2031 target for Japan’s Hayabusa2 extended mission. The new observations offer key information for the mission’s operations at the asteroid, just six years out from the spacecraft’s encounter with 1998 KY26.

There is much less water on the surfaces of distant planets outside our solar system than previously thought. These exoplanets do not have thick layers of water, as was often speculated. That’s the conclusion of an international study led by ETH Zurich.