indeksoj
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angla u...
ultraviolet = ultraviolo
ultraviolet source = ultraviola fonto
umbra = ombro
Umbriel = Umbrielo
Unicorn = Unukornulo
uniqueness theorem = teoremo de Vogt-Russell
universal time = Universala Tempo
universe = universo
upper culmination = supra kulmino
Uranus = Urano
ursids = malgrandursinidoj