Byss was a planet in the Deep Core, near the center of the galaxy, discovered no earlier than 45 BBY. A local day lasted 31 standard hours, and a local year lasted 207 local days. It was the endpoint of the Byss Run. Byss itself was somewhat of a myth, seeming to be the perfect place to live. Its eerie blue-green glow, caused by its sun, also added to the strangeness of the world. Despite this outward appearance, however, Emperor Palpatine's dark-side energies were everywhere, corrupting not only the inhabitants, but the planet itself. Byss was the secret throne world of Palpatine and the location of his towering Imperial Citadel. He also kept his secret supply of clone bodies there.