The telescope revealed galaxies that were billions of light-years away.

Meaning: The telescope allowed us to see galaxies that were very far away, billions of light-years away.

Choice of Words: Revealed means to make something known or visible. Galaxies are large collections of stars, gas, and dust held together by gravity. Billions means a very large number, equal to a thousand million. Light-years is a unit of distance used to measure the distance to stars and galaxies. One light-year is the distance that light travels in one year.

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