XSPECT telescopes on the SRG: optical performance

XUV digital in-line holography using high-order harmonics

XUV Doppler telescope with multilayer optics

XUV optical characterization of thin film and multilayer reflectors

XUV wide field camera for ROSAT.

Yellow-light Negative-index Metamaterials

Yield enhancement in whispering gallery mode biosensors: microfluidics and optical forces

Young and Waltzing Binary Stars

Young Binaries and Early Stellar Evolution

Young binary systems and their nearby environment: high-angular resolution observations

Young clusters near Earth, prospects for the future

Young Exoplanets Caught at Formation

Young Massive Star Clusters and Stellar Populations

Youngest Brown Dwarf Yet in a Multiple Stellar System

Ytterbium- and chromium-doped fibre laser: from chaotic self-pulsing to passive Q-switching

Zeeman slowing of thulium atoms

Zeeman-Doppler imaging of active stars. 3: Instrumental and technical considerations

Zelenchukskaya telescope

Zenith polarization and color ratio during twilight

Zenith sky brightness and airglow emissions during the equatorial solar eclipse of 30 June 1973