Ganymede was an Imperial world, until experimentation with the Squat technology of Warp-cores led to the place being "lost" to the Imperium "forever" and becoming "the eternal habitation of abomination". More precisely the "unlawful" experimentation with Warp coil technology resulted in the creation of a Warp gate. The Imperium since then prevents anybody from setting foot on the the world and wards space travel away from it.
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- 1: Warhammer 40,000 2nd Edition Rulebook, pg. 17
- 2: Codex Imperialis, pg. 73
- 3: Imperial Armour Volume One - Imperial Guard and Imperial Navy, pg. 11