Unidentified lights and flying objects have been reported in the skies for much of human history. Skeptics including various scientists, and organizations such as the Committee for Skeptical Inquiry, state that the entire topic can be explained as conventional objects or phenomena, while self-styled “Ufologists” disagree and instead argue in favor of various extravagant hypotheses. The topic of UFOs has been, and is currently, popular in worldwide culture in fictional movies, television, and other media. UFO reports are also the subject of continuing fascination in sensationalist media.
The expression sky’s the limit—which is usually preceded by the article in both speech and writing—is used to say that there are no limits; that anything is possible. As you know, a limit is something that bounds or restrains, say a maximum amount or an age requirement. The sky is a vast, boundless expanse that never actually ends (though at some point it technically becomes space). So saying the sky, which goes on and on infinitely is the limit, is saying that there’s in fact no limit at all—or, at least, there’s practically or metaphorically speaking no limit. It can be used in a wide variety of contexts, to talk about everything from someone’s aspirations and success to pricing.
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