Empty Places?

Hello: I am a biomedical scientist. I am looking for accurate information as to whether there is any space or region in the universe(s) where there is NO matter, molecule, atom, particle, etc. My assumption is that every such matter or particle will exhibit some motion/movement in the universe. I am looking for something that never moves. Please explain as much as possible. Thank you in advance for your prompt response.
- Vishwa (age 37)
Marion, AR, USA

The whole universe behaves as if it is filled with some sort of constant-density dark energy, so if you count that the answer is no. The whole known universe is also filled with dim low-frequency electromagnetic radiation left over from the Big Bang, the Cosmic Microwave Background. In addition some light from stars can be found everywhwere. Likewise there is a neutrino flux everywhere. If you don't want to count light as "matter" and don't want to count neutrinos because they interact very weakly with other matter, then remote space outside of galactic clusters is pretty nearly empty.

Mike W.

(published on 10/09/2017)