Henrietta Leavitt and the end of the universe

In the early 1900s, Henrietta Leavitt made one of the most
important discoveries in the history of astronomy: a yardstick to
measure distances to faraway stars. Using this tool, scientists
eventually transformed our understanding of the universe. They
realized space was expanding, that this expansion was accelerating,
and that ultimately, everything will end. For more, go to
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