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🗓️ 19 August 2025
⏱️ ? minutes
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What powers Cepheid variable stars? What about Mira variables and pulsating stars? And are there variable stars that don’t actually vary at all? I discuss these questions and more in today’s Ask a Spaceman!
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Hosted by Paul M. Sutter.
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1:22.6 | The goal. The ghoul, the demon star, the Gorgon, the head of the ogre, the mausoleum. Today we call it Algoal. But through the centuries, this star has had many names. Over 3,000 years ago, |
1:31.6 | the ancient Egyptians called it wedyat, or the raging one. According to one legend, |
1:38.1 | if the star became too angry, it would destroy the earth. And to ancient Egyptians, whose civilization depended on the orderly and regular flooding of |
1:47.5 | the Nile, a chaotic agent who could unexpectedly doom the entire world, was kind of a big deal. |
1:55.1 | Al-Gol is a variable star. |
1:58.2 | It's the second brightest star in the constellation Perseus, but roughly every |
2:02.9 | three days it dims considerably for a period of 10 hours before returning back to normal |
2:09.5 | brightness. Now, we don't know for absolute certain if the ancient Egyptians noticed this |
2:15.4 | variability because they often didn't talk directly and |
2:19.3 | candidly about astronomical phenomena. |
2:22.9 | Remember, for these people and many other cultures, celestial objects were manifestations |
2:27.7 | of divine beings and processes and other godlike activities. |
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