X-rays from magnetic intermediate mass Ap/Bp stars
X-ray redshifts with the International X-ray Observatory (IXO)
X-ray pulsars/Doppler integrated navigation for Mars final approach
X-Ray Properties of Normal Galaxies
X-Ray Observations of High-z Radio Loud-Quiet Quasars
X-ray observations of black-hole accretion disks
X-ray measurements of the dark matter distribution in clusters of galaxies with Chandra
X-ray lines and absorption edges in GRBS and their afterglows
X-ray line emission from cataclysmic variables
X-Ray Investigations of the Hot ISM
X-Ray Halos as a Possible Constraint on an Intergalactic Dust Component
X-Ray Fluorescence Spectrometer Onboard Muses-C
X-ray fluorescence-diffraction analyzer for the SELENE-B lander-rover mission
X-Ray Fllaments in Cluster Cooling Flows