We already brought up the lightsaber, so we might as well discuss them. Are these real or could they possibly exist? Well, yes and no. Basically, lightsabers use controlled energy and crystals to produce a sword in a hardened laser that is capable of cutting through pretty much anything. Right now, there is no such technology that exists but there are many that come pretty close. Several people have been able to make one out of a controlled laser, which is pretty simple but nothing big.
The one most find to be the closest is one made by the guys at the YouTube Channel, Hacksmith Industries. They formed the world’s first retractable plasma-based lightsaber. Of course, these types of sabers use A LOT of power. This means that while the actual lightsaber was formed by Hacksmith, it was over 4,000 degrees Fahrenheit and required liquid propane gas. Along with a big powerpack that has to be carried around. To make a lightsaber like the ones you see in the Star Wars universe, you’d need nuclear energy capable of using all of its power in a miniature state. Which as of now, is nonexistent.