Season 1 · Session 10
The Universe Pulls Apart
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If everything is flying apart, what is doing the pushing?
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The familiar universe, every star and planet and person, is about 5% of the whole. The other 95% we can measure by gravity but can't explain. Is it stranger that so much is unknown, or that we can be so sure it's there?
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We expected gravity to slow the expansion. In 1998 the data said it's speeding up instead, and the result overturned the assumption. What does it take for evidence to flip what scientists expected, and how should that feel?
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It's tempting to treat a gap like dark energy as a place to insert whatever we already believe. Science instead names it precisely and admits it doesn't know why. Why is 'we don't know yet' a stronger answer than a confident guess?
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How do you feel about this science and its understanding of reality?
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