【TED-Ed】Light seconds, light years, light centuries: How to measure extreme distances - Yuan-Sen Ting | eJOY English
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【TED-Ed】Light seconds, light years, light centuries: How to measure extreme distances - Yuan-Sen Ting

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High Intermediate
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Light is the fastest thing we knowIt’s so fast that we measure enormous distances by how long it takes for light to travel them.In one year, light travels about 6 trillion miles,
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