XMM x-ray mirrors: metrology and optical performance

XMM's X-ray telescopes.

XMM-Newton Observation of the Complex Absorbing Medium in IRAS 13349+2438

XMM-Newton Observations of M87 in X-ray and Ultraviolet

XMM-Newton observations of M87: X-ray Jet and Halo

XMM-Newton Results on High Resolution Spectroscopy

XMM-Newton Science Analysis Software: How to Bring New Technologies to Long-life Satellite Missions

XSPEC 12: Capabilities for Coded-Mask Spectral Analysis

XUV observations of solar corona in the spirit experiment on board the coronas-F satellite

XUV wide field camera for Rosat

Yardstick integrated science instrument module concept for NGST

YourSky: Rapid Desktop Access to Custom Astronomical Image Mosaics

Z-Spec: A MM-wave spectrometer for measuring redshifts of submillimeter galaxies

Zenith Star Launch System

ZEPLIN II Active Veto

ZEPLIN-II limits on WIMP-nucelon interactions

Zero CTE Glass in the Hubble Space Telescope

Zero distortion three mirror telescope designed for the Dark Universe Explorer (DUNE) space mission

ZERODUR for lightweight secondary/tertiary mirrors

Zeta OPH Interstellar Molecules - Cycle 2