In a hypothetical scenario where a 1 kg object is accelerated by a constant 1N force in space, it is debated whether this object can approach speeds close to the speed of light (0.9999999c). While some argue that continuous application of force is necessary for acceleration, others clarify that once the force is removed, the object will maintain constant velocity without further acceleration. The discussion also highlights the significant energy requirements to reach such speeds, with estimates suggesting that accelerating a 1 kg mass to 99.99% of the speed of light would require energy comparable to global energy consumption over a week. Additionally, the concept of "relativistic mass" is challenged, emphasizing that mass remains invariant regardless of speed. The conversation ultimately underscores the complexities of relativistic physics and the energy demands of high-speed acceleration.