Cosmic evolution of stellar disk truncations: from z=1 to the Local Universe

We present; out, recent results oil the cosmic evolution of the outskirts of disk galaxies. In particular we focus on disk-like galaxies with stellar disk truncations. Using UDF, GOODS and SDSS data we show how the position of the break (i.e. a direct estimator of the size, of the stellar disk) evolves with time since z similar to 1. Our findings agree with an evolution oil the radial position of the break by a factor of 1.3 +/- 0.1 in the last 8 Gyr for galaxies with similar stellar masses. We also present radial color gradients and how they evolve with time. At all redshifts we find a radial inside-out bluing reaching a minimum at the position of the break radius this minimum is followed by a. reddening outwards. Our results constraint several galaxy disk formation models and favour a scenario where stars are formed inside the break radius and are relocated in the outskirts of galaxies through secular processes.