Galaxy

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Galaxy

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A vast assemblage of stars, nebulae, etc., composing an island universe separated from other such assemblages by great distances. </dd>
The sun and its family of planets is part of a galaxy commonly called the Milky Way. The nearest galaxy to the Milky Way is the spiral galaxy Andromeda at a distance of approximately 800,000 light years. </dd>

References

This article is based on NASA's Dictionary of Technical Terms for Aerospace Use