BBC: Hundreds of worlds' in Milky Way

BBC NEWS | Science/Nature | 'Hundreds of worlds' in Milky Way: "Rocky planets, possibly with conditions suitable for life, may be more common than previously thought in our galaxy, a study has found.

New evidence suggests more than half the Sun-like stars in the Milky Way could have similar planetary systems.

There may also be hundreds of undiscovered worlds in outer parts of our Solar System, astronomers believe."