WIRE, Wide-field Infrared Explorer 〈WIRE〉广角红外探测器
WIYN Telescope, Wisconsin-Indiana- 〈WIYN〉望远镜
Yale-NOAO Telescope
WR nebula, Wolf-Rayet nebula WR 星云
Wyoming Infrared Telescope 怀俄明红外望远镜
xenobiology 外空生物学
XMM, X-ray Mirror Mission X 射线成象望远镜
X-ray corona X 射线冕
X-ray eclipse X 射线食
X-ray halo X 射线晕
