[Previous research in Europe may provide the answer. Scientists made artificial comets of finely powdered organic materials and ice in a vacuum.] They always ended up with a rigid, crusty material, ... If you were standing on it you might go right through it.  -   Donald Brownlee     Quotes
[Previous research in Europe may provide the answer. Scientists made artificial comets of finely powdered organic materials and ice in a vacuum.] They always ended up with a rigid, crusty material, ... If you were standing on it you might go right through it. Donald Brownlee
 Research