How to get three stars in angry birds space world 1 level 20
This level is pretty straight forward as far as angry birds space goes. All you need to do is use the first bird into the sky and press the screen on the far side of the row of pigs floating above the planet surface. This will ensure you enough points for another three stars. Check out the picture for a better idea of how to get it done.
A video of the level is embedded below