Side note 1

The thing I keep in mind, when confronted by the "Licensed Engineers have signed on to this so there must be something in it" argument, is the NASA Engineers who stated categorically and without reservation that there was no way in hell a 2 pound piece of foam could punch a hole in reinforced carbon carbon.

Force = Mass x Velocity

A marshmallow, if it's traveling at 160,000 mph (possible in deep space) will kill you dead.

Whether it will punch a nice neat little hole in you, or disintegrate on impact and in the process kill you through transfer of kinetic energy, i.e. blunt force trauma? I don't know. But it WILL kill you.