Scientists have detected a rocky planet that is smaller than Mercury, the smallest planet in our solar system, orbiting a solar-type star 80% of the size and mass of the Sun, according to research published in the journal Nature (Wednesday 20 February 2013). The exact dimensions of the star, and the absolute size of the planet, were determined by asteroseismologists led by the University of Birmingham.

More details can be found in the main news story on this website or in the original article in Nature magazine.