What physical forces are responsible for sculpting dramatic shapes in nebulae, such as the Pillars of Creation?

Answer

Magnetic fields and radiation pressure

In the near-vacuum of the interstellar medium, structures in nebulae are shaped dramatically by the influence of magnetic fields and the pressure exerted by stellar radiation.

What physical forces are responsible for sculpting dramatic shapes in nebulae, such as the Pillars of Creation?
Spaceastronomynebulaecosmicclouds