Everyone at that time imagined the atom as a "plum pudding ... planets around the sun. In 1912 Bohr joined Rutherford. He realized that Rutherford's model wasn't quite right.

THE beautiful conception which inspires and co-ordinates practically the whole of modern atomic physics is the atomic model of Rutherford and Bohr. Its essential feature-the nucleus-was first put ...

In 1913, Niels Bohr revised Rutherford's model by suggesting ... have fixed levels of energy within each type of atom. Bohr's 'solar system' model of the atom is the way that most people think ...

He discovered the atomic nucleus and developed a model of the atom that was ... quantum theory by Niels Bohr. For his work with radiation and the atomic nucleus, Rutherford received the 1908 ...