how many blocks high is space biom in minecraft

In Minecraft, a “space biome” isn’t a normal official biome, so there isn’t a fixed block height for it. If you mean a fan-made “space” area or dimension, people often place it above the world height, around Y=255Y=255Y=255 to Y=256Y=256Y=256 in older ideas, but that is not a standard Minecraft biome rule.

What this means

• Vanilla Minecraft: no official space biome exists.

• Fan ideas/mods: often start at or above the build limit, commonly around Y=255Y=255Y=255 to Y=256Y=256Y=256.

• If you meant a sky build: the practical “top” depends on your Minecraft version and build limit.

Simple answer

There’s no official block height for a space biome in Minecraft. In fan concepts, it’s usually imagined right above the world height.

If you want, I can also tell you the current build height limit for your Minecraft version.