Since an absorbing gas re-emits the light it absorbs, why are there dark lines in an absorption

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Since an absorbing gas re-emits the light it absorbs, why are there dark lines in an absorption spectrum? That is, why doesn't the re-emitted light simply fill in the dark places?
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Conceptual Physics

ISBN: 978-0321568090

11th edition

Authors: Paul G. Hewitt

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