Is that formula based on Earth and gravity or in space? I know it's possible though, big bang, black holes, utilizing other energy, may not be in our lifetime (the way for 'how' let alone the technology and means) but I think it will eventually happen.
It is a standard formula to calculate kinetic energy, that many high school students might remember. Applies anywhere in the universe. I have actually oversimplified, but I don’t want to bore people with the details. The formula is still reasonably accurate at, say 95% of light speed, but becomes less accurate as you get close to the speed of light, and in fact the energy required to actually reach light speed is infinite. In other words, it is even more difficult than my back of envelope calc suggests.
PS: I am no expert; I did a relativistic mechanics unit as part of Physics at Uni a very long time ago. I passed but it was probably my worst unit.