Is the Nether infinite?

Question

If I were to mine bloodstone upwards or downwards, left or right in one direction, would I hit bedrock, or would I keep on going? What would happen?

Answer

From Minecraft Wiki's page on The Nether:

... Under the Lava ocean, there is a layer of Nettherack¹ and Bedrock on the very bottom. Similarly, the very top of the Nether is Bedrock.

¹ Or Bloodstone

Basically, going up or down either way leads to Bedrock.

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