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Gaia galaxy
figures/Gaia_galaxie.jpg
The detection of exoplanets (with the photometry method, up to 200 parsecs from the Sun) is one of the projects of the Gaia mission (to be launched in 2011).
Copyright : ESA

The exoplanets discovered up until now are located close to the Sun, with distances of less than 100 parsecs, whereas our galaxy has a radius of 10 000 parsecs. We believe that 10 percent of the stars have at least one giant planet with a period of less than 10 years. There are about 100 billion stars in the galaxy. As a result, there should be of the order of ten billion planets in our galaxy.

And there are billions of galaxies in the universe....