Like to start, how do they even produce light? Also how do they stay together?
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There are either stars within the cloud of gas, or stars behind / around the gas giving them the energy to glow.
They don’t stay together. The clouds experience a “wind” like force from the light hitting them that blows them around, like dandelion puffs in the breeze. They also experience things like gravity that causes movement as well.
It’s just that they are soooooo big and sooooo far away that they look stationary. But if you did a time lapse over years and years you’d notice them changing shape.
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