Bill Nye explains light-years and the vastness of the universe
By Danya Gainor, CNN No matter what the James Webb Space Telescope, Hubble Space Telescope or our other tools of space exploration discover next, it’s likely to be located many light-years away. But how far away is a light-year — really? Our planet’s circumference is 24,873.6 miles (40,030.2 kilometers) and our planet is 93 million
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