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08/04/2025

ASTRONOMY - Moon Visits Sister Stars

 2025 April 8

A dark night sky is shown with clouds on the left. 
Just above center in blue is the Pleiades star cluster. 
Just below the Pleiades is a crescent moon, but bright 
enough so that you can see not only the brightly lit
crescent but, more faintly, the rest of the Moon.
Please see the explanation for more detailed information.

Moon Visits Sister Stars
Image Credit: Cayetana Saiz

Explanation: Sometimes, the Moon visits the Pleiades. Technically, this means that the orbit of our Moon takes it directly in front of the famous Pleiades star cluster, which is far in the distance. The technical term for the event is an occultation, and the Moon is famous for its rare occultations of all planets and several well-known bright stars. The Moon's tilted and precessing orbit makes its occultations of the Seven Sisters star cluster bunchy, with the current epoch starting in 2023 continuing monthly until 2029. After that, though, the next occultation won't occur until 2042. Taken from CantabriaSpain on April 1, the featured image is a composite where previous exposures of the Pleiades from the same camera and location were digitally added to the last image to bring up the star cluster's iconic blue glow.

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