Space Goo is a block introduced in update 1.5 of CastleMiner Z. Although it uses the same texture as the infamous Slime block of the original CastleMiner, it is very valuable and is essential in crafting the new energy weapons. It is found exclusively at the Alien Crash Site Biome and causes Aliens to spawn.
It can be found inside the meteorites, both Space Goo and Space Rock can only be mined with a Bloodstone Pickaxe or the Bloodstone light sword. Additionally, Space Goo is a decent source of light.