As the sun drops below the horizon and twilight begins, one by one the stars begin to sparkle in the sky. Within hours after sunset, the few have become hundreds and the hundreds are soon overwhelmed by thousands more. But why do they first appear one by one? Let's learn more about the stars. Originally, all stars able to be seen by the unaided eye were put into six categories of brightness. The 21 brightest stars were all called first-magnitude stars. These are the first to come out in the evening sky and are the last to disappear as morning approaches.
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