“Put two ships in the open sea, without wind or tide, and, at last, they will come together. Throw two planets into space, and they will fall one on the other. Place two enemies in the midst of a crowd, and they will inevitably meet; it is a fatality, a question of time; that is all.” -Jules Verne
There are plenty of questions one can ask about our local neck-of-the-woods here. As it stands, the more we learn and discover, the more we realize there is to learn and be discovered. On Monday, xkcd asked some of the most compelling and puzzling questions there are to ask about our very own Solar System.
Image credit: xkcd, via http://xkcd.com/1547/.
But there are so many more (and better) answers than the ones given, that I couldn't help myself! While there are a few "we don't knows" thrown in there, most of these have answers, and for most of the ones that don't have answers, we do have a whole lot of interesting things to say about them.
Image credit: NASA / JPL-Caltech.
Come find out all your Solar System answers to the best of our knowledge!
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The Oort cloud probably exists because the existence would explain the origin of comets. Comets consist of ice and rock. Where does the rock come from? On earth, rock forms at either high pressure or high temperature. How did rock form in the oort cloud?
Most of your answers are pretty well-written, except for the question "Did life start before it?" As I understand the question, "it" refers to the late heavy bombardment in the previous question. Randall is maybe asking if life could've survived extinction from the bombardment.
If so, then your answer is somewhat confused.