 The point, then, is that though at each time \(t_{i}\) (or period \({Dt}_{i}\)) scientists might well claim that their theories are not subject to radical change at subsequent times, they are not equally justified in making this claim! There might well be times \(t_{i}\) (or periods \({Dt}_{i}\)) in which scientists are more justified in making the claims that their theories are not subject to radical change at subsequent times simply because they have reasons to believe that their theories are truer than their predecessors. To give an example: if Wray’s argument is right then Einstein’s GTR is as likely to be overthrown at future time \(t_{2100}\) as was Aristotle’s crystalline spheres theory in past time \(t_{-300}\). But this is odd. It totally ignores the fact that all available evidence renders GTR closer to the truth than the simply false Aristotelian theory. In other words, that GTR has substantial truth-content makes it less likely to be radically revised in the future.