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If they are out there, how difficult would it be for us to reach them? Even if an alien civilization existed 100 light-years away, we couldn’t simply travel there quickly using conventional physics. According to relativity, accelerating a massive spacecraft to or beyond the speed of light isn’t possible. But relativity allows something strange: if you traveled extremely close to the speed of light, much less time could pass for you than for people on Earth. For example, a hypothetical journey at
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