If the earth spun away from the sun or the sun was blotted out?

could we survive on the energy and heat from the earth's core? I'm not saying it would be a great survival, but could it be done? And for the record, this is hypothetical. So don't just say "the sun can't be blotted out." or "this is just fiction." (I'm looking at you Nyx) show more could we survive on the energy and heat from the earth's core? I'm not saying it would be a great survival, but could it be done?

And for the record, this is hypothetical. So don't just say "the sun can't be blotted out." or "this is just fiction." (I'm looking at you Nyx)
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