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.
Which scientist discovered that it was the pull of the suns gravitational attraction that kept the planets in their orbits? It was Nicholas Copernicus. who discovered that the sun keeps the planets one Their orbit.