@CatLord Starting in the mid 2000's, radio astronomers began to detect high energy radio signals that last only a few milliseconds. Most occur randomly, and only a few have been found to repeat.

To date, no natural cause has been definitively proven, though it has been proven that the signals are coming from outside of our solar system. The only way the signal has been reproduced experimentally is by opening a microwave oven's door before it had finished cooking.