In the constellation of Perseus, around 93 light-years away, lies Algol, also known as the “Demon Star.” It’s a binary system where a dimmer star eclipses the brighter one every 2.87 days, causing a noticeable change in brightness, creating a characteristic “blink” that has fascinated observers for centuries. The star is also known as Beta Persei, β Per, 26 Persei, HD 19356, HIP 14576, HR 936, and SAO 38592.
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The Garden Astronomer 