X-ray Shadowing Experiments Toward Infrared Dark Clouds

X-ray Spectral Variations in the Youngest Galactic Supernova Remnant G1.9+0.3

X-ray spectroscopy of the hot has in the M31 bulge

X-ray variability of AGNs in the soft and the hard X-ray bands

X-raying Galaxies: A Chandra Legacy

X-rays from Blue Compact Dwarf Galaxies

X-rays from the Power Sources of the Cepheus A Star-Forming Region

X-Shooter GTO: Chemical analysis of a sample of EMP candidates

X-shooter observations of main sequence stars in the globular cluster NGC 2808: first chemical tagging of a He-normal and a He-rich dwarf

XHIP-II: Clusters and associations

XHIP: An Extended Hipparcos Compilation

XMM-Newton investigations of the Lambda Orionis star-forming region (XILO). I. The young cluster Collinder 69

XMM-Newton observation of 4U 1820-30: Broad band spectrum and the contribution of the cold interstellar medium

XSL: The X-Shooter Spectral Library

Young and intermediate-age massive star clusters

Young massive star clusters

Young Planetary Nebulae: Hubble Space Telescope Imaging and a New Morphological Classification System

Young starless cores embedded in the magnetically dominated Pipe Nebula

Young Stars and Protostellar Cores near NGC 2023

Young stars and reflection nebulae near the lower "edge" of the Galactic molecular disc