When a Star like our sun gets to be very old, after another seven billion years or so, it will shrink to a fraction of its radius and become a white dwarf star, no longer able to sustain nuclear burning. Studying the older planetary systems around white dwarfs provides clues to the long-term fate of our Sun and its planetary system. An artist's fanciful conception of an Earth-like "exomoon" orbiting a gas giant planet in a star's...

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