the size of the observable universe
scientists often work with phenomena that are not directly observable
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These events create the best aurora, and the extended auroral oval will be observable by most people.—Jamie Carter, Forbes, 3 Nov. 2024 The first observable is instantaneous acceleration — the ability to change direction and change your velocity very rapidly.—Johnny Dodd, Peoplemag, 21 Sep. 2024 And the other 82 percent is occasionally observable, too, thanks to the fleets of spacecraft that map the moon’s surface from space.—Sam Walters, Discover Magazine, 11 July 2024 October 25 – Europa is easily observable to one side of Jupiter by itself this morning using binoculars.—Jenny Porter Tilley, The Indianapolis Star, 17 Oct. 2024 See all Example Sentences for observable
Word History
Etymology
borrowed from Middle French & Latin; Middle French, "that must or can be observed," borrowed from Latin observābilis "capable of being observed," from observāre "to give attention to, watch carefully, observe" + -bilis "capable (of acting) or worthy of (being acted upon)" — more at -able
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