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[vanillasky]

 After a long life, most sun-like stars grow into red giants once they've depleted most of their hydrogen fuel. The relatively small region around the star which is just at the right temperature to support liquid water will extend as the red giant expands. This means that previously frozen planets (like Mars) could thaw out and life might have a second chance to happen in a solar system. There are currently 150 red giant stars within 100 light-years of the Earth, and many of these could be a place to search for life in addition to main-sequence stars similar to our own Sun.