Question
Which of the following is the MOST appropriate sentence to begin a formal acadernic essay about the
discovery of gravitational waves?
A binary star system is made of two stars, which both orbit around a shared barycenter.
Another important concept for understanding gravitational waves is that of angular momenturn.
O A major breakthrough was announced in 2016, when scientists reported they had heard and recorded
gravitational waves for the first time.
But even Einstein, who had some idea about gravitational waves, wasn't totally sure they were even real.