Not hard, but three stars is tricky for some. If you pop the largest pig, giant radish appears. It worth 10,000 points.
Golden Eggsteroid 4 is located on level 2-25 of Angry Birds Space. Zoom out to see the Golden Eggsteroid on the underside of the slingshot platform. Launch the Lazer Bird downward to get a good angle, then target him so he smashes into the Eggsteroid. Once you hit the egg you’ll immediately be transported via a wormhole to the level.
Fire Terence at the pig above, which when he crashes, he should land on the pig below that. Wait until the giant radish comes, then fire the Lazer Bird at the pig in the bubble.