Cosmos Recap: 99 Problems But A Hypernova Ain't One

 
 This week, Cosmos: A Spacetime Odyssey is determined to get cute with its episode title: "Sisters of the Sun" is about our sun's stellar sisters -- all the other types of stars out there -- but the episode is also about the women at Harvard who, in the early decades of the 20th century, made key discoveries about those stars, what they're made of, and how they'll eventually die. Also, this week's episode reprises a line of old-school Carl Sagan narration that has become something of a nerd touchstone -- which we'll get to later.

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