Where does Tor get its relay lists from?

[hikki at Safe-mail.net]

Every now and then, when you start Tor, it searchers for relays/descriptors. 
And I've heard that it does that every now and then while it tuns as well.

Does it get this list from a few static IP addresses that never change, 
or does it pick randomly from thousands of IP addresses/dir lists out there?
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