a scientist specializing in astronomy
Elementi sa atomskim brojevima od 89 (Aktinij) i 103
Mekan, srebrno-beli radioaktivni metal koji sija u mraku
Controlling the shape of a telescope mirror at a relatively slow rate.
Compensating for atmospheric distortions in a wavefront by high-speed changes in the shape of a small, thin mirror.
radioactive silvery metal which does not occur naturally
A unit for measuring acceleration, which is metre per second squared.
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skills or abilities in oral speech, ability of speech, fluency in speaking
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