Because it would be terribly rude of me to characterize sincere questions by others in that way. People send me their questions with a good heart, and to me I sincerely respect visitors asking me questions in what ever way they can formulate them. We are all on a journey to understand as much of our world as we can in the years granted us in THIS universe. Frankly, all of the questions I have received here are very good ones. You may read some of them and feel moved to laugh, but that is YOUR opinion, not mine. It would have been impossible for me to come up with the thousands of questions you see here as an astronomer. Sure, I know how to answer them with the professional resources I have, but many of the questions are ones I NEVER consider asking myself because I have other things to do. I am delighted to help others understand their world a little better, and let them know that at least they have nothing to fear from the physical world...and much to find in it that is awesome and incomprehensible. In that goal, there are no 'silly' questions.