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.
A region of the atom where electrons are found is called? Making the world better, one answer at a time. Who said an atom has a small positively charged nucleus surrounded by a large region in which scientists can predict where electron is likely to be found? Making the world better, one answer at a time.