简介：【原文】Butlet＇sstepbackforasecondhereandexplainwhatgravitationalwavesactuallyare.AccordingtoEinstein＇stheory,thefabricofspace-timecanbecomecurvedbyanythingmassiveintheUniverse.Whencataclysmiceventshappen,suchasblackholesmergingorstarsex-ploding,thesecurvescanrippleoutelsewhereasgravitationalwaves,justlikeifsomeonehaddroppedastoneinapond.BythetimethoseripplesgettousonEarth,they＇retiny（aroundabillionthofthediam-eterofanatom）,whichiswhyscientistshavestruggledforsomanyyearstofindthem.--NewYorkTimes.
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