Check out courses on your favorite topics on Brilliant! Get your first 30 days free as well as 20% off an annual premium subscription when you use my link ➜ https://brilliant.org/sabine. Correction to what I say at 1:42 -- it happens at the speed of light, not faster than light, sorry about that. No idea what I was thinking. What is empty space? In this video I summarize what physics tells us about this. What really are virtual particles? What do they have to do with the vacuum energy and can