Astronomers use the principle of parallax to measure distances to the closer stars. Here, the term parallax is the semi-angle of inclination between two sight-lines to the star, as observed when the Earth is on opposite sides of the Sun in its orbit.
Ernest Rutherford discovered that atoms contain mostly empty space, with his gold foil experiment. Bhor discovered that the electrons are not randomly placed around the nucleu â¦ s.
Galileo discovered that Earth moves. Copernicus discovered that Earth moves around the Sun. In 2000 Tom Chalko, inspired by Desmarquet's report, discovered that the solid nucleus of our planet is in principle a nuclear reactor, it is eccentric, and that our collective ignorance may cause it to overheat and explode.