Actually, macroscopic "particles" do behave the same as quantum particles. The real difference is that they are big (many orders of magnitude) by being collections of quantum particles. In this state, the quantum effects average out. With careful observation they can be seen to exhibit quantum instabilities, quantum spin, quantum electronic properties, etc.

You can calculate the probability that the earth will undergo quantum tunneling. It is so low that if every star in the universe (using the highest estimated number) had many planets, it would still be many orders below 1 for it ever happening in the whole life of the universe.

Years ago I found a terrific book called "Physics III" by Savylev (sp?), translated from Russian. It is a very small thin book, but each chapter has more information than some full sized textbooks. And even better, it is understandable. The chapter on solid state physics allowed me to get a B in a graduate level solid state course. The 350 page textbook did not have nearly as much information, and it was impossible to understand. I doubt the book is still in print, but if you can find it, jump on it - it's worth it!

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John