The universe we can see is big … really big. But what if it’s just a tiny piece of something way, way, way bigger?

In this episode, Eric teaches Sam about the evidence for this bizarre possibility. If we can’t even see 99 percent of the universe, how can we know it’s there? Can science really draw useful conclusions about something we can’t observe now and won’t be able to observe in the future? Spoiler alert: Eric has his doubts.

This is the third part in our continuing series on the scientific method.

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