Thread:Metal Mario875/@comment-32286613-20170723092217/@comment-26374068-20170723095936

In order to be 4-A, you must make (as the system explains it) an explosion cover the space of a solar system, and the all space to another solar system.

Basically, the explosion must cover the two solar systems, and all space in between. There was somewhere in the tens of stars in the sky that were effected, meaning this "explosion" would expand into the space of tens of solar systems. That's why it'd be 4-A. :)