re: So, what are the chances that the moon is the perfect size and distance from earth

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Correct me if I'm wrong but I believe the corona is due to our atmosphere deflecting light in billions of directions from the sun to us...to give the appearance of a corona. If there was a vacuum between us and the sun there would be no corona, right?

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Nope.

It’s a discrete element of the solar atmosphere, actually hotter than the surface of the sun.

It’s typically invisible because it’s so much less bright than the main solar body. In the eclipse the body is blocked, allowing for the corona to be visible.

It’s part of why scientists do so many observations during it.