Lambda Orion X 1: Astronomical ray source, Constellation, (constellation), Chandra Observatory, Extrasolar source astrometry

Cygnus X 6: Astronomical ray source, (constellation), Extrasolar source astrometry, visual Visibly dark

Aquila XR 1: Constellation, (constellation), Naval Research Laboratory, Extrasolar X ray source...

Abell 1795: Type-cD galaxy, Constellation, Boötes, Extrasolar X-ray source astrometry

First X-ray source in Andromeda: Astronomical source, Scorpius X-1, X-1 Andromeda (constellation),...