Artist’s conception of the view towards the young star Beta Pictoris from the outer edge of its disk. This disk of dust and gas orbiting the star is produced by collisions between and evaporation of asteroids and comets. A giant planet may have already formed and terrestrial planets may be forming. A young terrestrial planet gaining mass by collision with an asteroid is shown in the middle of the panel. The young terrestrial planet is dry, without an atmosphere. It will likely acquire one later from the impact of water (or other kind of ice)-rich asteroids. Credit:NASA/FUSE/Lynette Cook
