---
title: "What Fills The Vast Expanse Of Space? (Video)"
description: "By definition, 'empty' means devoid of matter, or lacking in substance. So when most people hear the term empty space, they assume that, indeed, space is entirely empty. Once upon a time, we thought this was true, but these days, we know that space isn't a perfect vacuum. It, in fact, contains things we can't even conceive..."
date: "2015-02-05"
modified: "2015-02-05"
authors:
  - name: "Jaime Trosper"
    link: "https://futurism.com/authors/jaimefqtq"
url: "https://futurism.com/fills-vast-expanse-space-video"
categories:
  - "From Quarks to Quasars"
---

# What Fills The Vast Expanse Of Space? (Video)

![](<https://futurism.com/wp-content/uploads/2015/11/Is-Space-Really-Empty.jpg>)

[![Is Space Really Empty](<https://futurism.com/wp-content/uploads/2015/01/Is-Space-Really-Empty.jpg>)](<https://futurism.com/wp-content/uploads/2015/01/Is-Space-Really-Empty.jpg>)

By definition, 'empty' means devoid of matter, or lacking in substance. So when most people hear the term empty space, they assume that, indeed, space is entirely empty. Once upon a time, we thought this was true, but these days, we know that space isn't a perfect vacuum. It, in fact, contains things we can't even conceive of, like [virtual particles](<https://futurism.com/replicate-hawking-radiation-lab>), which pop in and out of existence at a black hole's whim.

Learn more about spacetime itself and the particles inhabiting it in the video below:

## WATCH: "Empty Space is NOT Empty"

https://www.youtube.com/watch?v=J3xLuZNKhlY

## Author
Jaime is a freelance writer, who finds great joy in sharing the wonders of universe with others. She used this passion to launch "From Quarks to Quasars" in 2012.