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APOD Science APOD APOD: 2026 September 22 –… Today’s APOD Archive Submissions Index Search Calendar RSS Education About Discuss APOD Astronomy Picture of the Day Discover the cosmos! Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer. Chance Triple Alignment: […]
APODScienceAPODAPOD: 2026 September 21 –…Today’s APODArchiveSubmissionsIndexSearchCalendarRSSEducationAboutDiscuss APOD Astronomy Picture of the Day Discover the cosmos! Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer. Cocoon Nebula Wide Field Explanation: When does a nebula look like a comet? In this crowded starfield […]
APODScienceAPODAPOD: 2026 September 20 –…Today’s APODArchiveSubmissionsIndexSearchCalendarRSSEducationAboutDiscuss APOD Astronomy Picture of the Day Discover the cosmos! Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer. Analemma over the Callanish Stones Explanation: If you went outside at the same time every day and […]
APODScienceAPODAPOD: 2026 September 19 –…Today’s APODArchiveSubmissionsIndexSearchCalendarRSSEducationAboutDiscuss APOD Astronomy Picture of the Day Discover the cosmos! Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer. Night SkyAnnotation A Zodiacal Night Explanation: Also known as the false dawn, a luminous band of zodiacal […]
Mackerel skies and mare’s tails signal arrival of warm fronts that push moisture to high altitudes and creates distinctive clouds “Mare’s tails and mackerel scales make lofty ships to carry low sails,” runs an old English saying about summer skies. Mackerel skies are cirrocumulus or altocumulus clouds in regular but patchy rows, resembling the light and dark-scale pattern on a mackerel. The cirrocumulus version is white and wispy, altocumulus is grey and thicker. One easy rule is that cirrocumulus is narrower than a finger at arm’s length, altocumulus more like three fingers. Continue reading.
Wildfire smoke and ash can reshape aquatic ecosystems long after the flames have been extinguished Wildfires are an increasing problem in Europe and elsewhere. While their immediate effect on air quality is obvious, they can also trigger less visible but significant environmental effects, including algal blooms. An algal bloom is the rapid growth of algae and other plant-like microorganisms. These blooms can become so dense that they change the colour of the lake and seas. Although most are harmless, some produce dangerous toxins. When their blooms die, their decomposition depletes oxygen in t
APOD Science APOD APOD: 2026 September 17 – A… Today’s APOD Archive Submissions Index Search Calendar RSS Education About Discuss APOD Astronomy Picture of the Day Discover the cosmos! Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer. A Treasure […]
APOD Science APOD APOD: 2026 September 18 –… Today’s APOD Archive Submissions Index Search Calendar RSS Education About Discuss APOD Astronomy Picture of the Day Discover the cosmos! Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer. Messier 33: The […]
