If a group of masters decided to make everyone believe earth was still here would it seem like it was here?

Yes.
This is theoretical of course, but I realized this in my 20s that this was true. Culture is a form of group hypnosis. We are conditioned from the womb on to believe certain things. A master is beyond culture and understands the true nature of the universe.

Theoretically, if you had a group of masters all understanding all this, for example, say if earth blew up or was hit by a meteor or asteroid they could make most people believe that earth still existed if it was destroyed.

Why?

Because in the end neither earth or any other dimension human beings live on is ultimately real from a Master's standpoint. It is only relatively real. It is sort of like everyone sharing the same religion in a way where we believe Earth is real and then we all decide how we experience something. It is a group agreement.

However, a master goes beyond this to understanding the true nature of life. I suppose it is most like being a scientist who actually understands how all things work and what human beings are and what souls are.

Religions aren't about masters usually, they are about making money for ministers to survive and calming people who are afraid of dying.

But, if you are no longer afraid of dying (like soldiers often get partly from too much PTSD) then
by not being afraid of dying you no longer need religion (at least in a formal sense). You still need some sort of belief system but it becomes much more like how a scientist thinks which in an archaic form was like Merlin, and Plato and Socrates and Aristotle then Galileo and Newton and all the others.

So then, if earth nuked out or was hit by a Meteor and was over could Masters here on earth make most people believe earth was still here?

Yes.

What would happen then?

The people that believed earth still existed would go on as if nothing had happened only in a dimensional dream world. But, it would seem exactly as if nothing had happened.

However, Time Cadres of the United Nations do this sort of thing every day with technology by reversing nukes and mass terrorist poisonings of millions of people and various other things through retroactive time travel.

So, there are many ways to accomplish the well being of most people who tend to be sane and rational and physically and mentally healthy.

Could people still have children and live good lives in any of these new dimensional realities?

There is a chinese saying that is interesting regarding all this.

"There once was a man who woke up and had dreamed he was a butterfly but then wondered whether he was a butterfly dreaming he was a man or a man dreaming he was a butterfly?"

Think what it would be like if someone was playing a video game non-stop for 1 years time with VR goggles on (not that it would actually be possible because of eating and sleeping and baths and going to the bathroom). But, if it were possible and after 1 years time someone took off their VR goggles would what awaited them be real for them or would the video VR game be real?

So, what is reality anyway?

It is what you believe it is in your heart mind.

This is true of everyone and because we all have different experiences in life it is different for everyone.

Yes.