Astronomers discover supervoid 1.8 billion light years across

[xelasnave]

Steven very helpful link thank you.
It's getting a second read.

[Eratosthenes (Peter)]

Originally Posted by xelasnave

Peter I should have acknowledged my knowledge of Casimir effect.

Have you read the OP in a new thread in this section on NASA's new electrodynamic drive which apparently operates in a vacuum? The researcher offered an explanation that is based upon the quantum vacuum - ie virtual particles.

[xelasnave]

Peter I have not but I will.