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Yamato 791198
Yang, Chen Ning (1922–)
Yangel, Mikhail K. (1911–1971)
yard
Yardley, John F. (1925–2001)
Yarkovsky effect
yaw
Yeager, Charles ("Chuck") (1923–2020)
year
yeast
yellow fever
Yerkes Observatory
yin and yang
Yohkoh
yolk sac
Young, John Watts (1930–2018)
Young, Thomas (1773–1829)
young (surface)
young stellar object
ytterbium
yttrium
Yukawa, Hideki (1907–1981)
YY Orionis star