I think that there MIGHT be. I am not completely sure, but I don't think that we should say that anything is impossible until it has been proven.
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No not likely. All of the higher elements are unstable and the heavier they get the more unstable they are. All of the lower elements are known and exist here on earth.
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No. I accept the Periodic Table of Elements is valid for the entire universe.
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it's possible
at the very least other planets have the same elements in very different amounts
at the very least other planets have the same elements in very different amounts