Okay kiddo, so Lockheed Martin is a company that makes really cool airplanes that fly super duper fast. One of their newest planes is called the SR-72.
This plane is still being made, but when it's done, it will be able to fly faster than any other plane in the world. It is called a "hypersonic" plane because it will fly at speeds of 6 times the speed of sound. That's really, really fast!
The SR-72 will look kind of like a long, skinny triangle. It will have two wings that point out like a "V" and it will have two engines that will make it go really fast.
This plane is not just for fun though. It's made for the military to help keep us safe. It will be able to fly really high up in the sky and go really fast so it can get to places really quickly, which could help stop bad things from happening.
That's the basics of the SR-72 airplane. It's really complicated and there's a lot more to know about it, but for now, just know that it's a really amazing plane that will be able to go really fast and help keep us safe.