🚀 Visit Andromeda… But Lose Millions of Years?

Brian Cox explains how Einstein’s theory of relativity turns sci-fi into science. If you travel close to the speed of light, time slows down—for you. You could reach the Andromeda Galaxy in your lifetime. But when you return to Earth, **millions of years may have passed**.

It’s not a paradox—it’s physics. Time dilation means your clock ticks slower than the universe around you. So while you experience a short journey, the rest of the cosmos races ahead. Cox calls it “the ultimate time machine”—but one-way.

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