I’m amused by scientists who claim that someday a meteorite will destroy the earth; I just can’t imagine an outer-space rock causing destruction on a planetary scale...something has always seemed to me to be missing from their equation.
So, I’ve developed the concept of Molecular Kinetic Synergy to account for that elusive factor. Simply explained, it means that the greater the size of the object impacted – in absolute (total), not relative, dimensions – the greater its potential to synergistically “absorb” the force. In other words, scientists conducting an experiment in their laboratory using, let’s say, a billiards ball propelled against a globe composed of earthly materials (dirt, rocks, sand, water, lava/liquid metal) would not derive analogous results as would be observed if a proportionately-sized meteorite were to hit us.
The reasons are two-fold: First, regardless of how well-calibrated and life-like the experiment (with its proportioned masses, densities, forces), a laboratory globe does not consist of as many molecules – as a total quantity – as our actual planet consists of. Secondly, nor would any globe have anywhere near the immense gravity of earth, itself, to moderate the reaction of the impact.
Considering that the size of a given molecule is a "constant", the greater the total number of molecules present, the more "absorbant" the target becomes. That same principle determines if a couch, for example, is perceived as "soft" or as "rigid": the more comfortable ones have more cushion (molecules) conforming to your shape – thus providing more surface area to sustain your weight.
Thusly, a real asteroid colliding with earth would be analogous to your propelling yourself onto a couch with "memory foam", instead of onto a relatively "course" (in effect) bean-bag. Likewise, the dynamics of meteorite collisions onto planets are qualitatively – and not just quantitatively (as in "proportionately") different from experiments performed in a lab.
Furthermore, to any objections concerning the “insignificance” of a lowly molecule…let us not forget, ironically, that almost all falling rocks are amazingly vaporized by the very atmosphere of earth – with its significantly less potential Molecular Kinetic Synergy than our oceans or land obviously have!
In conclusion, we mustn’t worry about "needing to defend” our planet from meteorites; the astronomical quantity of molecules that it consists of (together with its natural gravity at work) will suffice to “cushion” us from the unduly-imagined catastrophe that, until now, we thought would be our fate. The odds are scarier that nuclear war, super viruses, and/or unprecedented solar flares on a cosmically grand scale will exterminate us all before any falling rock has a chance to. Can you dig it?