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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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You can use the free Mathway calculator and problem solver below to practice Algebra or other math topics. Try the given examples, or type in your own problem and check your answer with the step-by-step explanations.


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