Do Lightsaber Blades Have Mass?

The article asks whether a lightsaber blade has mass by comparing it with light and ordinary objects.

It uses Newtonian motion and Newton’s second law to test what kind of blade a lightsaber could be.

The physics point is that if a lightsaber were truly made of light, it would be massless and could not behave like a solid weapon.

That helps explain a long-running Star Wars question: a blade that can clash and stop cannot literally act like a laser beam.