Those are quasars (supermassive black holes), not pulsars (neutron stars).
They are not pulsing, they have variations.
Anyway, meter and second are defined as fraction of c, which ruins any discussion about variability of time or distance, because we are talking about c instead.
However, when we are talking about variable time, we need to talk about variable size too. If distant quasar was 5x slower, then it must be 5x larger.
Anyway, meter and second are defined as fraction of c, which ruins any discussion about variability of time or distance, because we are talking about c instead.
However, when we are talking about variable time, we need to talk about variable size too. If distant quasar was 5x slower, then it must be 5x larger.