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Yes. But for the next billions of years it will be fine, because stars form within a few million years, and last for billions. It can sustain itself for a while. However I am referring to plant earth. Read the first edit.
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Hang on, are you sure about this?
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Yeah. We both talked about this. Read edit one.
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Yeah, to my understanding the jury is still out as to whether the universe is a closed system. I'd tend towards the fact that it isn't simply because I don't see how it could have been caused if it wasn't subject to outside influence.
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I'm also unsure about the creation, but I know that suns can sustain themselves for a while.