Exoplanets (Currently 229, last updated Jan 13, 2013) with known radius and period/semi-major axis of their orbit, mostly to scale.
Sun is in the center and the red circle is the orbit of mercury, to scale.
To give you a sense of scale - the orbit or Mercury, let alone the Eart would be barely vsible on the screen, most of the discovered exoplanets are very, very close to their star
Data taken from exoplanetarchive.ipac.caltech.edu.