This is the level in the game in which things are measured in many kilometers. Once you ascend twice from the base level, you will get to this level, thus its position is 2. In this level, you will be able to explore your solar system and find planets, moons, asteroids, and the star at the center of the solar system.
Ascend: Cosmic Level
Descend: Landform Level
The size of this level appears to be quite large, or possibily infinite, to the landform level below it. However, when using asteroids and other objects as comparisons, the planets in the planetary level are actually quite small by planetary standards. The size of this layer appear to start at 1 km and extend to 1000 km across.
The list of all objects types in this layer: