> You can't "prove" that something doesn't exist You could definitely prove that something doesn't exist in any meaningful quantity. Happens all the time: The

> You can't "prove" that something doesn't exist You could definitely prove that something doesn't exist in any meaningful quantity. Happens all the time: The experiments searching for new particles end up proving that if they do exist, they interact too weakly to be detectable. Similarly you could make observations which place an upper bound on the dark matter density, possibly low enough that it cannot explain the galaxy rotation curves etc. anymore.