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All stars are primarily hydrogen, with some helium. Most stars contain a varying amount of trace elements as well, but hydrogen and helium are normally at least 98% of any star.

However, Antares is a "red supergiant" star.

That means it's heading towards being a supernova.

Its composition will be complex as it fuses heavier elements up to iron and nickel.

It depends exactly where it is in its evolution to the supernova stage.

Perhaps someone knows a more exact answer.

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11y ago

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