In order to keep oxygen away from a light bulb’s filament on Earth, some bulbs have most of the air removed, others are simply filled with an inert gas (one that does not burn or aid combustion). For combustion as we know it, oxygen must be present. If oxygen were present the glowing hot filament would burn up. The intense temperature makes the filament glow brightly. This filament gets very hot when an electric current passes through it.
The typical incandescent light bulb contains a thin wire (usually tungsten) called a filament that has a high electrical resistance. Thus phenomena that we experience here on Earth act differently under the weightless conditions found in "space." For example, what is the shape of a candle flame burning in a chamber of air on a spacecraft? It is not tapered as it is here on Earth. We may have all heard of interesting things happening in space where there is a weightless environment (not gravity free) or where there is no air. Can a light bulb burn in space where there is no air without glass around it? August 2002 I have heard a light bulb has glass around it to keep air away from the filament.
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