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Reference.org
First light (astronomy)
open-in-new
<p>In <a href="/facts/Astronomy/0ArJVM1p">astronomy</a>, first light is the first use of a <a href="/facts/Telescope/BDwYahhR">telescope</a> (or new instrument) to capture an <a href="/facts/Astrophotography/NeWNUJEn">astronomical image</a> after construction. This typically follows initial optical tests to align components. </p>