August 25, 2025
You are a way for the cosmos to know itself, Carl Sagan once said. On your birthday, the cosmos got to know itself a little better.
The Meteor and the Star Cluster
Birthday · August 25, 2025
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APOD published August 25, 2025. Credit: Yousif Alqasimi & Essa Al Jasmi. A publication-date match, not a photo taken on your date. Independent of NASA.
Sometimes even the sky surprises you. To see more stars and faint nebulosity in the Pleiades star cluster (M45), long exposures are made. Many times, less interesting items appear on the exposures that were not intended -- but later edited out. These include stuck pixels, cosmic ray hits, frames with bright clouds or Earth's Moon, airplane trails, lens flares, faint satellite trails, and even insect trails. Sometimes, though, something really interesting is caught by chance. That was just the case a few weeks ago in al-Ula, Saudi Arabia when a bright meteor streaked across during an hour-long exposure of the Pleiades. Along with the famous bright blue stars, less famous and less bright blue stars, and blue-reflecting dust surrounding the star cluster, the fast rock fragment created a distinctive green glow, likely due to vaporized metals. Jigsaw Universe: Astronomy Puzzle of the Day
Image credit: Yousif Alqasimi & Essa Al Jasmi