In what ways is Carl Sagan's Cosmos outdated?

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I want to watch Cosmos again but I worry about its age -- what should I keep in mind when watching?
 
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I won't be able to enjoy it as much if I am taking in outdated facts. I was just wondering what has been updated since.
 
Most of it is probably pretty accurate...cosmology hasn't made any huge leaps in a while (measurements of background gamma radiation and deep space telescopes aside).
 
I can't help but tear up when I watch Cosmos. :/