The Schwarzschild radius is a physical parameter that shows up in the Schwarzschild solution to Einstein's field equations, corresponding to the radius defining the event horizon of a Schwarzschild black hole.
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Switzerland is a mountainous Central European country, home to numerous lakes, villages and the high peaks of the Alps. Its cities contain medieval quarters, with landmarks like capital Bern?s Zytglogge clock tower and Lucerne?s wooden chapel bridge. The country is also known for its ski resorts and hiking trails. Banking and finance are key industries, and Swiss watches and chocolate are world renowned.

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