Question

why space is empty? need a good answer fast i will mark as brainnliest

Answer 1

An atom is mostly empty space, butempty space is mostly not empty. The reason it looks empty is because electrons and photons don't interact with the stuff that is there, quark and gluon field fluctuations. It actually takes energy to clear out space and make a true 'empty' vacuum.

now mark as BRAINLIEST

Answer 2

A hydrogen atom is about 99.9999999999996% empty space.

An atom is mostly empty space, butempty space is mostly not empty. The reason it looks empty is because electrons and photons don't interact with the stuff that is there, quark and gluon field fluctuations. It actually takes energy to clear out space and make a true 'empty' 
And as in the rest of physics, its nature has turned out to be mind-bendingly weird: Empty space is not really empty because nothing contains something, seething with energy and particles that flit into and out of existence. Physicists have known that much for decades, ever since the birth of quantum mechanics.

I This Much Is Enough