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Oort, Jan Hendrik Line breaks: Jan Hen|drik Oort

Definition of Oort, Jan Hendrik in English:

( 1900–92), Dutch astronomer. He proved that the Galaxy is rotating, and determined the position and orbital period of the sun within it.

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Word of the day fortissimo
Pronunciation: fɔːˈtɪsɪməʊ
adverb
(especially as a direction) very loud or loudly