How to get three golden stars in angry birds space world 2 level 27
I have found it is best to use just one bird to get your golden stars on level 2-27. Shoot it so it hugs the surface of the biggest planet. It will continue on to the gravitational field of the smaller ice planet and go around it to. When it gets to the point where I have marked out the small arrow press your screen on the other side of the small planet. The bird will hit the crate and set of a series of events ending up in no more pigs.
A video guide of the whole thing below: