the size of the observable universe
scientists often work with phenomena that are not directly observable
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After all, there are still around 1090 of them left over from the Big Bang within merely our observable Universe.—Big Think, 28 Oct. 2025 The Golden Gate Bridge had no observable damage but was located about 60 miles north of the quake’s epicenter.—Adrian Rodriguez, Mercury News, 27 Oct. 2025 But last week saw an observable upwelling of anxiety, reflecting a break of the preceding low-volatility climb and some possible pent-up selling from historically elevated equity allocations.—Michael Santoli, CNBC, 18 Oct. 2025 There’s nothing wrong with that, but the observable crinkles may be diminished.—Robin Miller, AZCentral.com, 17 Oct. 2025 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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