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As most of you know, Luna was banished to the moon for 1000 years, but how did she stay sane for that long... About 75 years into her banishment, Luna was wandering the moon, maping the surface because she had nothing better to do, when she found a goey puddle that started to move in a crater. A head formed out of the pool, so Luna tried talking with it. Blob didn't seem to understand what she said, but was very interested in the new creature.
After Blob learned how to form vocal cords and breaking the language barrier, Luna and blob became good friends, keeping eachother occupied in the desolate landscape.
A few months before Luna's banishment ended, she launched Blob back twards the Equestria to get used to where they will be living.