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Its story

4 Lacertae is a hot blue star lodged in a late, modest constellation —the Lizard, sketched by Hevelius in the seventeenth century to fill the gap between Cygnus and Andromeda. Almost 2,250 light-years away, its light was launched near the close of the first millennium: no human eye watching the sky then could have guessed the spark was a B-type giant burning hydrogen at savage temperatures.