X band model of Venus atmosphere permittivity
X-exoplanets: an X-ray and EUV database for exoplanets
X-Ray Absorption Spectroscopy of Fe-Substituted Allophane and Imogolite
X-ray photoelectron spectroscopic studies of dolomite surfaces exposed to undersaturated and supersaturated aqueous solutions
X-ray probes of Jupiter's auroral zones, Galilean moons, and the Io plasma torus
Xerophiles on Mars: Possible Evolutionary Strategies Using Hydrogen Peroxide and Perchlorates