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50 "Y"

Yagi
Yagi antenna
array of Yagi antennas
Yagis
Yale bright star catalog
sidereal year
yearly secular
yellow dwarf
yellow line
yellow region
yellow spot
yellow star
Yepun
Yerkes refractor
Yerkes spectral classification system
Yerkes system
quantum yield
ylem
fork yoke
yoke design
yoke mounting
Yolo telescope
Young's modulus
young star
y ()

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Rambler's Top100