Astronomical unit
/ / / Astronomical unit / AU /
baade, walter
/ / / baade, walter / /
wedge
/ / / wedge / /
Venus express
/ / / Venus express / /
Bessel. friedrich Wilhelm
/ / / Bessel. friedrich Wilhelm / /
William huggins
/ / / William huggins / /
Herschel, (Frederick) William (1738-1822)
/ / / Herschel, (Frederick) William (1738-1822) / /