This one is a short one, but I think it's very cool (despite the obvious temperatures involved).
My friend Ken spotted this in a group called The Brain Maze on Facebook.
In zero gravity, a candle flame forms a small blue sphere instead of the familiar teardrop shape.
Without gravity, hot air doesn’t rise, so the flame no longer stretches upward.
Instead, gases spread evenly in all directions, creating a smooth, round flame.
This environment allows the fuel to burn more completely, which is why the flame appears blue and produces no soot.
The result is a calm, gentle orb of fire that behaves very
differently from a candle flame on Earth.
Just amazing.