X Mensae
X век
X-15 Flight 3-65-97
X-15 Flight 90
X-Ray & Optical Study: Low Core Density Globular Clusters NGC6144 & E3
X-Ray K Absorption Spectroscopic Study
X-ray probe of ultra-fast outflows in active galactic nuclei
Xallarap
Xanadu (Titan)
Xandar
XF5700 Mantis
Xi Aquilae b
Xi Bootis
Xi Puppis
Xi Sculptoris
Xi Telescopii
XII век
XIII век
Xiuhpohualli
Xiuhtecuhtli
XIV век
XMMXCS 2215-1738
XV съезд ВКП(б)
XVIII век
XX век
XXI век
XZ Tauri
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