Ida and Lin 1

These scientists conclude:

"Many planetesimals and embryos migrate to the proximity of their host stars, especially in the limit of relatively efficient type I migration. Many cohesive collisions may also occur among these planetesimals and embryos in the proximity of their host stars. Provided most of these planets are retained (despite the effect of their interaction with the magnetosphere and tide of their host stars), we anticipate the fraction of solar type stars with short-period earthmass objects to be several times that of short-period gas giants. The physical composition of these close-in planets is most likely to be rocky to icy. Their observed mass distribution will enable us to calibrate the magnitude of the type I migration (the magnitude of C1). The next step is to extrapolate and to calibrate the fraction of low-mass M-dwarfs and high-mass G sub-giant stars which may bear potentially habitable planets."

We may soon find Earth twins, if they are right.