Why does Safari spontaneously close, particularly when I'm not at my computer?

Ever morning when I sit at my computer, I find that Safari is no longer open, even though I left it--along with Mail, Calendar, and a few other programs--open when I walked away from my laptop (MacBook Pro 2.4 GHz Intel Core i5 running OS X 10.8.4). Anyone have any idea of how to fix this?

"Automatic app termination manages the life cycle of apps behind the scenes, terminating apps that are not being used and allowing the reclamation of resources such as memory. With this feature, users no longer need to explicitly quit apps (although they still can, if they want to). Instead, the operating system is responsible for managing app processes with the goal of ensuring optimal system performance."
Mac Technology Overview: Cocoa Application Layer

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