&gt;<i>If the laws of physics are universal (fingers crossed), then this factor gets canceled out</i><p>This is beside the point, as parent already explained what he meant in his first 2 sentences: &quot;Physics. More specifically, &#x27;conditions&#x27;&quot;.<p>So, yes, the laws of physics might be universal, but gravity is X here and N on the moon, pressure is Y here and M under the sea, temperature, etc...