What are wormholes? An astrophysicist explains these shortcuts through space-time
A wormhole is like a tunnel between two distant points in our universe that cuts the travel time from one point to the other. Imagine two towns on two opposite sides of a mountain. People from these towns would probably have to travel all the way around the mountain to visit one another. But, if they wanted to get there faster, they could dig a tunnel straight through the mountain to create a shortcut. That's the idea behind a wormhole.
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