Stars glow because they are hotter than the surrounding area.
See related question.
The matter making up the star condenses
Earth does not glow.
nuclear fusion
yes actually glow worms have a chemical reaction in their behind and this causes a glow this glow attracts other insects towards the glow worms so that they can eat them
Hydrogen
the computer tells it to glow.
Timing is slowed.
It's a safe assumption by "glow sticks", you're referring to Lightsabers.
at the party at star cafe 2010
The atmosphere of the earth.
Fluorescence
Neon has a bright, white glow when it has been lit. Plutonium also has a bright glow, due to its reaction with oxygen.