For question 1: Fire is the combination of an element or compound with oxygen. In this case, you are thinking of either hydrogen being burned to form water, or maybe the combustion of methane. For either of these, the key is oxygen. Jupiter does not possess free oxygen in its atmosphere like Earth does. Therefore, no "burning" can take place. In fact, if you wanted to have a fire on Jupiter, you would bring along a bottle of oxygen. For number 2: Jupiter is a mixture of various gases and ices, like ammonia ice, water ice, etc.. This is what helps create the cloud features we see on its surface. There are probably a lot of people who could explain this better than I, but these various substances more than likely "stratify", like clouds in our own atmosphere. An object plowing through these layers would certainly disrupt them. It wouldn't really be an combustion-type "explosion". Instead, there would be energy released from the tremendous friction generated - just like a meteor coming into our atmosphere. Anyway, there's my $.02 worth. George "Mike Loftus" <mikeloftus@xxxxxxxxx> To: az-observing@xxxxxxxxxxxxx Sent by: cc: az-observing-bounce@fr Subject: [AZ-Observing] Jupiter eelists.org 06/07/2004 09:52 AM Please respond to az-observing A friend of mine in Prescott wrote and asked the following questions. Would anyone care to elaborate? Mike I have always been told that Jupiter is a giant ball of gas that is primarily hydrogen. 1. Why don't the immense lightening bolts that occur on Jupiter ignite the planet? 2. Since Jupiter is a "gas ball", why did the comet (string of pearls) make such a huge visible explosive impact when it hit the "surface". There is no surface, just gas! Dave -- See message header for info on list archives or unsubscribing, and please send personal replies to the author, not the list. -- See message header for info on list archives or unsubscribing, and please send personal replies to the author, not the list.