The abstract of the paper by Bellucci et al that is the source of the Guardian article states that "Two, currently unresolvable hypotheses for the origin and history of the clast are allowed by these data", i.e a lunar or an earth origin. Whereas the Guardian article suggests pretty unambiguously that the study says an Earth origin. So basically, not very good reporting from the Guardian, but did generate a few extra clicks through for them I guess.
The abstract of the paper by Bellucci et al that is the source of the Guardian article states that "Two, currently unresolvable hypotheses for the origin and history of the clast are allowed by these data", i.e a lunar or an earth origin. Whereas the Guardian article suggests pretty unambiguously that the study says an Earth origin. So basically, not very good reporting from the Guardian, but did generate a few extra clicks through for them I guess.