Lightsabers from Star Wars Are Possible, Says Science; But We Can’t Have It, Here’s Why

Martin Archer of Queen Mary University, London says, "Lightsabers do seem feasible from a physics point of view - but huge advances in technology would be required to make lightsabers a reality"

But this is not the only problem at hand.
Archer says, "Magnetic reconnection is a fundamental plasma physics process which can occur when plasmas with different magnetic fields collide. As the magnetic fields of each plasma get close to each other, the entire pattern of magnetic field lines changes and everything realigns into a new magnetic configuration - releasing huge amounts of energy."

"When two plasma blades clash it is almost impossible to avoid magnetic reconnection, with the results being an explosive release of the plasma contained in both sabers. This would mean that, if you were in a lightsaber duel, both you and your opponent would have body parts vapourised in a single clash!"

The claim made by Archer was supported by another researcher, James Bennett, who is a huge fan of the Star Wars series.
"It is difficult to know what is going to happen, but if we understand what we think we understand, then it is unrealistic to have a lightsaber that looks and acts like the one in Star Wars," he said.

Bennett said that Lightsaber was initially known as laser-sword because it is made of plasma, as the electrons are taken out. However, plasma is a gas and it cannot be contained together, let alone turning it into a sword with a single push of a button. For the lightsaber to become a reality, a powerful casing will be required and potent magnets.

 "It is possible to trap plasma: the way you do that is by using strong magnetic fields; charged particles like to move in spirals when they are trapped in magnetic fields," he explained.