What is a light-year?

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A light-year is more than just the way we measure the cosmos - NBCNewsMACH

 

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MACH A light year is the distance light travels through space in a year's time.

MACH It’s how we measure a day while Trump’s in office and Republicans are enabling his corruption and incompetence.

MACH the distance light travels in a year

MACH Wait? No Trump bashing today?

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