The site hosting the videos is likely violating copyright law. Phil Plait over at Bad Astronomy took down his link to the site so as to discourage piracy. If you're going to watch the series (which I highly recommend, by the way), it's worth spending a bit of cash instead. The series is available for rent or purchase from Netflix and Amazon.com.
Buying it is a bit pricey (I bought the series some months ago, having loved it back when I was young), but it's worth every penny. Heck, it's almost worth watching just to hear Carl Sagan say, "billions and billions."
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Buying it is a bit pricey (I bought the series some months ago, having loved it back when I was young), but it's worth every penny. Heck, it's almost worth watching just to hear Carl Sagan say, "billions and billions."