Nobody expected that the first gravitational waves would be observed from a binary black hole system.
Gravitational waves were discovered for the first time on Earth on September 14, 2015. These ripples in spacetime, predicted by Einstein in 1916, were caused by the merging of two black holes in a faraway galaxy. In a nutshell, the power emitted was 50 times that of all the stars in the Universe combined. However, this was not the only amazing component of the event. Each of the black holes had a mass of about 30 solar masses. Because a black hole is what remains after the majority of a star explodes as a supernova, the predecessor stars must have weighed at least 300 solar masses. Such stars are quite rare nowadays. However, the two black holes may be leftovers of the very first generation of stars – assumed to be massiv
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