Astral space was a faster-than-light layer of space most commonly used byLong Ago.
An astral drive requires a certain element that is abundant to Jalexy. The longer distance the ship has the travel, the longer it takes to enter Astral space. When you charge an Astral Drive with this element, the ship will disappear to into another phase. This is jumping to the Astral plane, where the speed of light is infinite. They then proceed using normal engines, and thus the longer the distance, the faster the ship travels. The percentage of the time taken to make the jump is dependant on the percentage of power concentrated into the Drive. For instnace, if I put 25% power into an Astral drive, it would be 100% effecient, and 25% would be 50%. The drive can only work at 100%, though.