Question

What keeps space empty?

Answer 1

Answer:

Vacuum

Explanation:

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Answer 2

Answer:

Vacuum energy (also called vacuum fluctuations or zero-point energy) is a sea of particles and antiparticles flashing briefly into and out of existence. Vacuum energy has a very real effect because it weakens, or screens, electric fields.

and also the mainly the space is not empty there is dark energy and dark matter and also anti matter particles which are filled in space