Originally Posted by Sol88
And again for the hard of thinking;
No rock ever detected at a comet. Nobody is claiming that the comet isn't mostly vacuum. What do you think Patzold means by 'porous'? Do you know what porous means?
And what do we think those pores are filled with in the vacuum of space? Honey? You really should give up on this science lark, and concentrate on the basics, such as English, maths and comprehension.