Entropic Gravity
So far my absolute layman understanding of dark matter is: &quot;Well, the observations do not fit the theory. But <i>if</i> there was this huge amount of matter that we just cannot see, it would work out well.&quot; Whereas the alternative theories boil down to: &quot;Well, we do not know how gravity works <i>over there</i>, so maybe it just works like this.&quot; Whereas the usual answer is: &quot;No it cannot work like this, because [OBSERVATION&#x2F;FORMAL ARGUMENT].&quot;<p>Did I get this (roughly) right?<p>So from my perspective: Is there any prediction that would prove the existence of dark matter? Preferably something that could be invoked repeatedly?