Masses in example sentence
A year later, in 1916, Einstein derived from his theory that gravitational waves existed, and that these waves were produced when masses move, like, for example, when two stars revolve around one another and create folds in space-time which carry energy from the system, and the stars move toward each other.
More example sentences with word masses
And the Canadian Minister of the Interior wrote this at the time: "Thousands of pack horses lie dead along the way, sometimes in bunches under the cliffs, with pack saddles and packs where they've fallen from the rock above, sometimes in tangled masses, filling the mud holes and furnishing the only footing for our poor pack animals on the march, often, I regret to say, exhausted, but still alive, a fact we were unaware of, until after the miserable wretches turned beneath the hooves of our cavalcade. 
