How is astronomy different from cosmology?
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Astronomy is the study of objects and phenomena beyondEarth, whereascosmology is a branch of astronomy that studies the origin of the universe and how it has evolved. For example, thebig bang, the origin of thechemical elements, and thecosmic microwave background are all subjects of cosmology. However, other subjects such asextrasolar planets andstars in the presentMilky Way Galaxy are not.