A note to be kept in mind: there is a lot that we don’t know about subatomic and quantum level physics. The below video is based on a theory – an unproved/not-properly-proven speculation. Just recently did we confirm the existence of the Higgs-Boson.
[So much knowledge is just waiting to be discovered. Feels good man.]
Also, just in case you missed it – Vacuum Decay is not related to the notion of ‘vacuum in space’ (atleast not directly).