First light (astronomy)

In astronomy, first light is the first use of a telescope (or, in general, a new instrument) to take an astronomical image after it has been constructed. This is often not the first viewing using the telescope; optical tests will probably have been performed to adjust the components.

This article is about the testing of telescopes. For the first light of dawn, see Twilight ยง Nautical twilight. For the cosmogonical age, see first light (cosmology).
First light image from the Kepler space telescope
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