That's not really considering existence that deeply though. Nothing has to be something. Gravity and radiation are transmitted through the void of particle-less space. If nothing were truly nothing in an absolute sense....that couldn't be possible. Something permits information to pass from point to point through interstellar space where there are on average 100 particles per cubic meter.
What did the universe explode into during the big bang and expansion?? Nothing is actually really weird.
I recommend all of the videos on history of the universe on YouTube