<p>This is a very complex answer. It has to do a lot with gravity and electromagnetism. Nebulae are made of particles that act according to those forces and give you the illusion of viscosity. Those particles are actually moving. Take a look at this simulation it might give you an idea: <a href="https://www.youtube.com/watch?v=YbdwTwB8jtc" rel="nofollow">Simulation</a> </p>

CC BY-SA 3.0
2013-11-21T05:25:00.780Z
2013-11-21T05:25:00.780Z
CharlieK
<p>Why do some nebulae look like the billowing clouds? Wouldn't that require something like a viscosity in empty space?</p>

<star><nebula>
Why is there billowing dust in nebulae?
user342
# Why is there billowing dust in nebulae?

(Asked by: username_0 on 2013-10-30)

Why do some nebulae look like the billowing clouds? Wouldn't that require something like a viscosity in empty space?

**Tags:** star, nebula

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## 1 answers

### Answer by username_1 on 2013-11-21. Score: 3

This is a very complex answer. It has to do a lot with gravity and electromagnetism. Nebulae are made of particles that act according to those forces and give you the illusion of viscosity. Those particles are actually moving. Take a look at this simulation it might give you an idea: [Simulation](https://www.youtube.com/watch?v=YbdwTwB8jtc)


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