What is Ether?
 

And are we really in a dome and earth is flat or is the earth a sphere?

The earth like all celestial bodies is most decidedly a sphere.

Ether is a short chain organic compound of the ether group combining oxygen with an akl or sometimes methane.

In daily use it is in the form of a volitile colorless liquid related to both alcohols and amines and is used in medicine and also as an industrial solvent.

If you happen to be talking about the ether in etheric plane/body etc...

It has been used to describe what scientists call the electromagnetic field.

It has also been used to describe what scientists and others call the 'chi' energy field, orgone, bioplasma.

On occasion it has also been used to describe what some call the aura, that which is photographed using kirlian photography.

Love, Light and Power to you!

P.S. a flat or sphere is purely a matter of perspective ;)

I read when Bj said 'ether', as the black space that holds and supports the planets.

The flat earth theory is quite funny, and I have my own idea why it was brought to life.
The existence of Aether on the other hand was dismissed after scientists could not detect it 150 or so years ago. It became taboo to even mentioning it by name. Now scientists simply calling it by a different name, like zero point energy and others.

Well......with my background in organic chemistry I completely misunderstood the sort of ether being discussed. .....oh well.