If we had sent a radio signal to an advanced civilization in 2006 which is located in the zeta reticuli star system approximately 39 light-years away, when would the signal arrive at its destination

2045

Explanation:

Given

We had sent a radio signal to advance civilization in 2006 which is 39 light-years away i.e. time taken by light to reach reticuli star system is 39 years.

So, it will arrive the destination in the year

.) the observation by semmelweis that more mothers died of childbed fever when their doctors also worked in the morgue