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"There's a place called the Graysha Nebula. We don't know much about it. But there are rumors of a sentient species living in that area. And there are rumors that the Yeerks are exploring the nebula. My old ship, the StarSword, went there to see if it could locate a Yeerk task force we were pursuing."
Elfangor-Sirinial-Shamtul to Loren[src]

Graysha Nebula is mostly a non-explored nebula somewhere in the galaxy. The Andalite StarSword was exploring the area because of rumers of an intelligent race living somewhere there. While they did not encounter any intelligent beings, they did however encounter energy-hungry Living Asteroids that killed dozens of Andalite fighters.