Or, a flame in free-fall. Regardless, earlier (see post below) Commander Chris Hadfield answered the perplexing problem what happens when you wring a wet rag in space? In that post I mused that I recalled seeing an experiment years ago of a flame in space. Who knew? Hadfield shows the curious action:
In Space, a Candle Burns
The results of a Burning and Suppression of Solids (BASS) experiment demonstrates that in zero-gravity—where heat doesn't rise—a flame burns in a uniform oval. More amazing Hadfield photos at Popular Mechanics.