Why is space a vacuum?

 Basically, any two objects with mass will be attracted to each other. That's gravity. Put another way, "matter likes to be around other matter," Faherty said.

https://www.livescience.com/why-is-space-a-vacuum.html#:~:text=Suction%20cleaner%20might%20be%20a,but%20because%20it's%20nearly%20empty.