It seems that the tree is there because you look at it, ditto your cat, or dog or cow. Ergo, we can say that before life existed, our universe did not exist?
Then, why is it that scientists say that our universe just popped up on its own some 12-14 billion years ago?
This is all very confusing.
What about you? Do you exist when no one is looking at you?
Of course we know we do exist, even if no one is looking at us. We are certain about it. But not according to quantum physics - you are not!
You exist because you are observed.
It seems that at the quantum level, there is no such a thing as certainty, only probabilities. To confuse us further, a particle or thing can be at multiple places simultaneously.
You are either this or that - just probabilities. And only when you are being observed are you a certain this or that. Not until then.
Fascinating. Go figure it out.
But let me leave you with what physics Nobel laureate Eugene Wigner once said:-
"..not possible to formulate the laws of quantum mechanics in a fully consistent way, without reference to the consciousness (of the observer) ...the very study of the external world led to the conclusion that the content of the consciousness is the ultimate reality."