Dark energy is what will end the universe. We have lots of ideas, but we don't know if any of them are right. Option one for the end of time is the heat death of the universe. But how? How will it end everything? Katie says there are two main possibilities. And that leads to some fun speculation.
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.
This episode originally ran on June 30, 2021.
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