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Normal Stars & Star Clusters
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Normal Stars - The hot
outer atmospheres, or coronas, of normal stars such as our Sun produce X-rays.
X-ray observations are useful for understanding how the heating of the coronas
depends on the age, rotation and type of the star, and how the flaring activity
of stars changes as stars evolve.
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Binary and Multiple Star
Systems - The evolution of stars is changed if they are in a close
binary system. These changes depend on how close the stars are to one another,
and how massive the stars are. Some of the strongest X-ray sources in our galaxy
are close binary systems containing neutron stars and black holes.
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Stellar Evolution
- Stars shine as a result of nuclear reactions deep in their interior. As a
star's nuclear energy supplies are used up, it evolves toward an end state that
depends on its mass.
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