Hello, just a couple of questions
I stumbled across the term "galaxy plane", and i got confused about it..
How do you define galaxy plane? Or better, WHERE do you define it? Im thinking... if the galaxy is 1000 light years thick, where would a galaxy plane be? In the statistical middle? Cause planes should be infinitely thick, right?
Second question: Are we (the human race) absolutely sure that the Sun is moving up and down the so called galaxy plane on its orbit around the galaxy center. Can you tell me what experiments confirmed this, and who did those experiments, and when.
Thanks in advance!