The journal Nature recently published this letter announcing the exciting discovery of seven exoplanets 40 light-years away from Earth: only 235 trillion miles away! Does this mean it would take us 40 Earth years to reach those planets if we could travel as fast as the speed of light? The infographic below says light-years are a measure of distance, not a measure of time. Bonus question: Why can’t we travel faster than the speed of light, or can we?
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