"My youngest son often asks whether a particular object in the sky is a planet or a star. If it’s a planet, of course, he wants to know which planet. Some of them I can pick out. Venus isn’t usually rocket science (no pun intended). Mercury can be a little tougher. Fortunately, I stumbled across a video blog from Wolfram Alpha yesterday that describes their efforts specifically in the field of astronomy." - Kol Tregaskes from Bookmarklet