Answer:
IT'S TIME TO PLAY BALLS LICKING
Answer:
The relationship between the two sentences in the excerpt is that the second sentece is explaining the reason why the events of the first sentece ocurred.
In the first sentence, a fact is introduced: the Mongols tried to invade Japan twice, but typhoons impeded them from doing so both times. The second sentence clarifies why: the severe weather produced by the typhoons destroyed most of the Mongol fleet, which forced them to retreat.
It has a positive connotation, suggesting the astrophysicist's long lasting and innocent fascination with the universe.