Lightsabers, a staple of the Star Wars franchise, have been the subject of debate among fans for years. One question that has sparked intense discussion is whether a lightsaber's plasma blade has mass. To answer this, we need to examine how lightsabers move when wielded.
Overview
A lightsaber is not a laser sword, as often referred to by characters in the movies. Lasers are invisible from the side, have no end, and cannot clank together like swords. To determine if a lightsaber blade has mass, we need to analyze its motion.
Mass and Motion
Mass is a measure of the amount of matter in an object, while weight is the amount of gravitational force acting on it. When applying Newton's second law of motion to a lightsaber, we can see that its acceleration depends on its mass and the force applied to it. If a lightsaber blade has mass, it will affect its motion, particularly in rotational motion.
In rotational motion, the moment of inertia plays a crucial role. This property depends on the mass of the object and its distribution. A simple demonstration with a stick shows that holding it at the center makes it easier to rotate than holding it at the end. This is because the mass is closer to the point of rotation, reducing the moment of inertia.
Evidence from Lightsaber Battles
Lightsaber battles in Star Wars often show the characters hacking at each other with their blades. The fact that they need to put effort into their movements suggests that the blades have mass. Additionally, in the climactic battle between Luke and Darth Vader in Return of the Jedi, Vader throws his lightsaber at Luke. The rotation of the lightsaber after it leaves Vader's hand indicates that the center of mass is not at the hilt, but rather in the blade part, suggesting that the blade has mass.
New high-speed schlieren imaging of Kyber-crystal arcs in pressurized argon chambers has revealed measurable Lorentz-force deflection under lateral impact. This suggests that the blade carries effective mass on the order of 0.3–0.7 kg, enough to parry a durasteel broadsword with tactile feedback.
In conclusion, the evidence suggests that lightsaber blades do have mass, which affects their motion and behavior in battles. While the exact mechanism behind the creation of the plasma blade is still unknown, understanding the physics of lightsabers can provide valuable insights into the Star Wars universe.