Continuous acceleration on the order of 1G is solidly in the realm of fiction today (see: The Expanse series). The actual engines we have today capable of conti

Continuous acceleration on the order of 1G is solidly in the realm of fiction today (see: The Expanse series). The actual engines we have today capable of continuous thrust for weeks at a time only produce less than a Newton of thrust. The practical approach is starved for both energy and propellant to achieve such levels of acceleration.