X & Y

X and Y Spermatozoa

X and Y waves in the spatiotemporal Kerr dynamics of a self-guided light beam

X Crucis

X Cyg: observations from 1886 until today

X line distribution determined from earthward and tailward convective bursty flows in the central plasma sheet

X Muscae-A Large Amplitude Red Variable

X Per-Optical circular polarization

X Per: The Template Sightline for the Diffuse Interstellar Medium

X Persei

X Persei active again!

X Persei an X-ray Source?

X ray absorption by dark nebulae (HEAO-2 guest investigator program)

X ray and EUV emission spectra of oxygen ions precipitating into the Jovian atmosphere

X ray jets in the solar corona: Observations with YOHKOH Soft X Ray Telescope

X ray microbursts in the South Atlantic magnetic anomaly

X ray radiographic imaging of hydrodynamic phenomena in radiation driven materials: Shock propagation, material compression and shear flow

X ray spectra from HINOTORI satellite and suprathermal electrons

X rays

X rays and crystal: II. The Structures of silicates