 For our purposes, the key feature of STR is its claim that, for many pairs of events, there is no absolute fact of the matter as to which event, if either, happened first, or whether both occurred at the same time. The question of precedence has different answers according to different frames of reference, and there are no grounds for selecting any single frame of reference as the one which gives the ‘real’ answer. This means that, for many events, there is no absolute fact of the matter as to whether they are occurring in the present, in the past or in the future. (If they were occurring now, they’d be occurring simultaneously with your reading this sentence, but there’s no absolute fact of the matter about this simultaneity issue.)