X-ray fluorescence spectra obtained by the MESSENGER spacecraft orbiting Mercury
indicate that the planet’s surface differs in composition from those of other terrestrial planets. …

… Cat Hawkins Hoffman is a supervisory natural resource specialist and program manager
and David J. Lawrence is an aquatic ecologist with the US National Park Service Climate …

The major post-Cassini knowledge gap concerning Saturn’s icy moon Titan is in the composition
of its diverse surface, and in particular how far its rich organics may have ascended up …

The MESSENGER Gamma-Ray Spectrometer measured the average surface abundances of
the radioactive elements potassium (K, 1150 ± 220 parts per million), thorium (Th, 220 ± 60 …

A Gamma-Ray and Neutron Spectrometer (GRNS) instrument has been developed as part of
the science pay load for NASA’s Discovery Program mission to the planet Mercury. Mercury …

Using Dawn’s Gamma Ray and Neutron Detector, we tested models of Vesta’s evolution
based on studies of howardite, eucrite, and diogenite (HED) meteorites. Global Fe/O and Fe/Si …

Measurements by the Neutron Spectrometer on the MErcury Surface, Space ENvironment,
GEochemistry, and Ranging (MESSENGER) spacecraft show decreases in the flux of …

Ecosystem transformation involves the emergence of persistent ecological or social–ecological
systems that diverge, dramatically and irreversibly, from prior ecosystem structure and …

Orbital gamma‐ray measurements obtained by the MESSENGER spacecraft have been
analyzed to determine the abundances of the major elements Al, Ca, S, Fe, and Na on the …

NASA's Dragonfly mission will send a rotorcraft lander to the surface of Titan in the mid-2030s.
Dragonfly's science themes include investigation of Titan's prebiotic chemistry, habitability…