the size of the observable universe
scientists often work with phenomena that are not directly observable
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Uncovering this story, coupled with the recognition that the raw ingredients that led to life on Earth are found in billions of star systems across our galaxy and in trillions of galaxies across the observable Universe, has led to some tremendous questions and some equally tremendous speculations.—Ethan Siegel, Big Think, 7 Oct. 2025 Some odd extreme readings are observable from the remarkable degree of big-cap index resilience and wide-swinging/fast-rotating individual stocks and sectors.—Michael Santoli, CNBC, 3 Oct. 2025 In our task, a trial-and-error strategy could not work because the objects to be ordered were not directly observable; children could not rely on perceptual feedback.—Celeste Kidd, The Conversation, 3 Oct. 2025 To foster constructive disagreements, organizations should encourage individuals to modify their observable behaviors during conflicts.—Harvard Business Review, 2 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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