This is really a good news. A galaxy is a massive, gravitationally bound system consisting of stars, an interstellar medium of gas and dust, and dark matter. Our Sun and Earth are part of the Milky Way galaxy. Basically the Sun is one of the stars in the Milky Way galaxy; the Solar System includes the Earth. Now scientist suggests more than half the Sun-like stars in the Milky Way could have similar planetary systems just like our solar system. In other words there may be many more worlds in our galaxy. From BBC news site:
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.
Future studies of such worlds will radically alter our understanding of how planets are formed, they say.