Particles in example sentence
Physicists have told us for a long time that the metal of that train looks solid but really it's mostly empty space with microscopic particles zipping around.
More example sentences with word particles
And what starts happening is that, around young suns, young stars, all these elements combine, they swirl around, the energy of the star stirs them around, they form particles, they form snowflakes, they form little dust motes, they form rocks, they form asteroids, and eventually, they form planets and moons. 
