When alpha-rays hit a thin foil of gold, very few alpha-particles are deflected back. What does it prove ?

When alpha-rays hit a thin foil of gold, very few alpha-particles are

1.	When alpha-rays hit a thin foil of gold, very few alpha-particles are deflected back. What does it prove ?
Answer» Solution :There is a very SMALL HEAVY body PRESENT within the atom, called NUCLEUS