In the vast and infinite cosmos, if there's something abundant, it's planets.
According to calculations, within the Robert Star System, there are at least 400 billion planets, with each Stellar Vortex averaging at least 4 billion planets.
Of these 4 billion planets, 99% can be said to be non-habitable planets, simply put, these planets do not possess the conditions to give birth to life.
Once reaching Tier 2 in the Interstellar Society, one earns a title known as 'Planet Exploration Warrior,' which means they can explore these non-habitable planets by relying on individual power.
And these non-habitable planets vary greatly, including toxic planets, gaseous planets, lava planets, strong gravity planets, liquid planets...
