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They are very sparse. Typical densities are in the range of 100 to 10,000 particles per $\textrm{cm}^3$. This is much more dense than the general interstellar medium (1 particle per $\textrm{cm}^3$), but much, much less dense than anything you are used to - air is around $10^{19}$ particles per $\textrm{cm}^3$. You would very easily see your own hand in a ...


In my opinion that "collapsing nebula" image is somewhat misleading, because the trajectory of dust/gas particles would be (ignoring magnetic field) an orbit and not a free fall collapse. However collisions make particle change orbit, and the particles whose new orbits comes closer to the future sun experience more collisions (because of the higher density ...

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