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**Did You Know?** If you leave Earth at the age of **15**, board a spaceship traveling at **the speed of light**, and spend **5 years in space**… when you return to Earth, you’ll be **20 years old**. But your friends—who were also 15 when you left? They’ll be **65 years old**. This isn’t science fiction—it’s **real physics**, known as **time dilation**, a consequence of **Einstein’s theory of relativity**. Here’s why: As an object approaches the speed of light, time slows down for that object re
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