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What is retrograde motion? And why is the moon moving backwards?
What is retrograde motion? See an image that appears to show the moon moving backwards! An explanation, and more bizarre examples, here.
September 11, 2026
Do black holes have hidden hair? Scientists are searching
If black holes have extra matter around them - aka hidden hair - astronomers could find it by measuring the different characteristics of these ripples.
September 10, 2026
Zodiacal light: Start watching for it now
The zodiacal light is an eerie light extending up from the horizon before dawn around the Northern Hemisphere autumn. Southern Hemisphere? Look after sunset!
September 10, 2026
What is an Equal Earth projection map? See comparisons here
Everyone is familiar with the Mercator map, a flattened view of Earth. But what is the Equal Earth projection map, and how does it compare?
September 10, 2026
Delta Cephei helps measure cosmic distances
Delta Cephei is an inconspicuous variable star in the northern constellation Cepheus the King. This important star helped establish the cosmic distance scale.
September 10, 2026
Peptides in Venus’ clouds could form life-giving shapes
A new study from MIT shows that peptides in Venus' clouds could survive in the sulfuric acid droplets and fold into the shapes need for biological life.
September 9, 2026
Will fall migration 2026 bring a billion bird night?
Will we see a billion bird night during fall migration this year? And get tips on how you can help birds by turning off exterior lights.
September 9, 2026
Fall hummingbird migration in progress across North America
The fall hummingbird migration typically lasts from August through October. Spot the birds in every U.S. state and Canadian province as they travel south.
September 9, 2026
Orion’s Belt points to Sirius on September mornings
Use Orion's Belt to find Sirius, the sky's brightest star. In 2026, Jupiter is in the same region, outshining even Sirius.
September 9, 2026
How many stars can you see on a moonless night?
Have you ever wondered how many stars are visible on a given night? It depends on factors including how dark your sky is and what your age is.
September 9, 2026
