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Light-Year, Universe

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A series of free Science Lessons for 7th Grade and 8th Grade, KS3 and Checkpoint Science in preparation for GCSE and IGCSE Science.

What is a light-year?
Distances in space are enormous - so big that our standard units of measurement, kilometres and miles, are just too small to be useful.
So scientists use something else - the light year.
But what is it and how does it work?
1 light-year is the distance traveled by light in one year.

Earth Compared To The Rest Of The Universe

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