Where to start? First of all, this instalment of Cosmos is the weakest in the series. Neil Tyson deGrasse was tolerable in the other series he hosted up to this point but sadly there is a huge decline in the substance and narration in the series in general & in this episode. IMHO Carl Sagan would not care for Neil's assumptions and scientism. Let's face it, Mr. DeGrasse is not in the same league as Carl Sagan. I can watch episodes of the original mini-series over & over again.
The only reason this episode warrants a 3 from your truly, is due to the filming of the episode. As usual that is top notch.
IMHO it's time for Seth Macfarlane & Neil to take a permanent vacation from Cosmos.