Neutron Spectrometer tagged posts

The Fast Neutron Spectrometer with a cover removed to show the circuitry inside. Credit: Image courtesy of University of Alabama Huntsville

The Fast Neutron Spectrometer (FNS) is now aboard the International Space Station. Neutrons contribute to crew radiation exposure and must be measured to assess exposure levels. The FNS, developed by NASA’s Marshall Space Flight Center (MSFC) and Johnson Space Center (JSC), uses a new instrument design that can significantly improve the reliability of identifying neutrons in the mixed radiation field found in deep space. The MSFC principle investigator and team lead is Mark Christl. The NASA JSC project manager is Catherine Mcleod and the technical lead is Eddie Semones at NASA JSC.

“Our technique improves upon the well-establish ‘capture-gated’ method...

This oblique image of Basho shows the distinctive dark halo that encircles the crater. The halo is composed of so-called Low Reflectance Material (LRM), which was excavated from depth when the crater was formed. Basho is also renowned for its bright ray craters, which render the crater easily visible even from very far away. Credit: Courtesy NASA/Johns Hopkins University Applied Physics Laboratory/Carnegie Institution of Washington

Scientists have long been puzzled about what makes Mercury’s surface so dark. The innermost planet reflects much less sunlight than the Moon, a body on which surface darkness is controlled by the abundance of iron-rich minerals. These are known to be rare at Mercury’s surface, so what is the “darkening agent” there?

About a year ago, scientists proposed that Mer...