Starfield with the red supergiant Antares

Starfield with the red supergiant Antares

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Credit: ROYAL OBSERVATORY, EDINBURGH/SCIENCE PHOTO LIBRARY

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Caption: Starfield with Antares (alpha Scorpii), a red supergiant star 500 light years from the Earth. The red supergiant phase is one of the final stages in the life of a normal star, when almost all its hydrogen content is burnt. In this phase the outer layers of the star are greatly inflated by a thin shell of hydrogen burning around a central core of helium. Antares has a diameter of roughly 1 billion km, a surface temperature of 3100K and a mass 10-15 times the solar mass. The globular star cluster NGC 6144 is at top right.

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Keywords: alpha scorpii, antares, astronomy, cosmology, field, globular star cluster, ngc 6144, red supergiant, science, scorpius, star, star cluster, star evolution, starfield antares, stars, stellar

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