July 12, 2022
Even the most precise clock in the world cannot measure how unlikely your existence really is.
Noctilucent Clouds over Paris
Birthday · July 12, 2022
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APOD published July 12, 2022. Credit: Bertrand Kulik. A publication-date match, not a photo taken on your date. Independent of NASA.
It's northern noctilucent cloud season. Composed of small ice crystals forming only during specific conditions in the upper atmosphere, noctilucent clouds may become visible at sunset during late summer when illuminated by sunlight from below. Noctilucent clouds are the highest clouds known and now established to be polar mesospheric clouds observed from the ground. Although observed with NASA's AIM satellite since 2007, much about noctilucent clouds remains unknown and so a topic of active research. The featured image shows expansive and rippled noctilucent clouds wafting over Paris, France. This year, several northern locations are already reporting especially vivid displays of noctilucent clouds.
Image credit: Bertrand Kulik