For most of the 20th century, astronomers assumed the universe's expansion was slowing down under its own gravity. Then in 1998, observations of distant supernovae revealed something nobody expected: the expansion is speeding up. Join us as we trace how that discovery was made, meet the mysterious force behind it, and explore why "dark energy" — despite making up roughly 68% of everything in existence — remains one of the biggest unsolved puzzles in modern physics. No equations required, just a healthy sense of cosmic mystery. 

Class level: Introductory - This class is recommended for guests of any background.

Tickets:

Non-members $25/class

Members $20/class

Student (with valid ID) $10/class

Image credit: NASA