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Zeta Ophiuchi, a supergiant that is twenty times the mass of the…

Zeta Ophiuchi, a supergiant that is twenty times the mass of the Sun and is about 450 light years away, is a runaway star. It is racing through space at 54,000 miles per hour; a bow shock is visible, formed in the dust and gas in its path, caused by the stellar wind from the star.

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