3 ms·
Does the calculation of how long ago this event occurred account for the speed at which the universe is expanding? Does it need to?
by nsxwolf 9y ago
Does the calculation of how long ago this event occurred account for the speed at which the universe is expanding? Does it need to?
- ahnitz 9y agoWe do account for the expansion of the universe in fact. We estimated that this source was at about z ~ 0.2 (see https://en.wikipedia.org/wiki/Redshift https://en.wikipedia.org/wiki/Redshift). Roughly speaking this means there'll be only ~20% effect as the scale of the universe (a) has increased by (1+z) over the time it has traveled.