Moon doesn't have an atmosphere, so you can't start a fire on Moon. You need air to burn to fuel a fire. But above is what happens when they lit a fire on the ISS, which experiences weightlessness due to constant acceleration, so basically, a fire that isn't influenced by the effects of gravity.
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So, in a nutshell, it's basically just plasma?
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Edited by The Cellar Door: 4/5/2016 2:59:29 AMNot exactly. It's just an excited gas. Plasma is ionized gas, fire is chemical reaction of a gas.