Answer:
Albert Einstein announced his greatest achievement, the general theory of relativity, in Berlin a century ago, on November 25, 1915. For many years, hardly any physicist could understand it. But, since the 1960s, following decades of controversy, most cosmologists have regarded general relativity as the best available explanation, if not the complete description, of the observed structure of the universe, including black holes.
And yet, even today, hardly anyone apart from specialists understands general relativity – unlike, say, the theory of natural selection, the periodic table of the elements, and the wave/particle duality in quantum theory.
Explanation:
