What Is Killing the Galaxies of the Virgo Cluster?

Galaxies die when they run out of the interstellar clouds of hydrogen from which new stars form. While existing stars continue to shine, no new stars will be born to replace them when they eventually expire. But what strips the hydrogen from galaxies, and why do large collections of galaxies such as the Virgo Cluster contain both dead galaxies and those with active star-forming regions?

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