Golden Eggsteroid 2 is located on Level 1-20 of Angry Birds Space. The Golden Eggsteroid is hidden in the tall brush atop the planet. Fire a Lazer Bird above it, then redirect him into the Eggsteroid. Once you hit the egg, you’ll immediately be transported via a wormhole to the level.
The pig can be tricky to kill.
Fire the Red Bird as high as you can at the stone brick floating at the top. A pig should fall down, only to get killed by the Red Bird, which should have fallen down onto the ground "floor" below.