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Posts by
EarthSky
Mares’ tails over the Pacific Northwest
Mares' tails - aka cirrus uncinus clouds - are found high above Earth's surface, where the air is very cold. They might mean rain is on the way.
July 21, 2021
Why and how fireflies light up
A firefly's familiar glow is caused by a chemical reaction. Why and how fireflies light up here, plus many wonderful firefly photos.
July 19, 2021
Thank you, Eleanor Imster
Say good-bye to Eleanor Imster, a fixture at EarthSky since 1995.
July 14, 2021
Love sea turtles? Here are 7 cool facts
Sea turtles are fascinating creatures. Learn some facts about these much loved marine reptiles.
July 14, 2021
Earth
Low-latitude noctilucent clouds in June 2021
Noctilucent cloud season has returned to Earth’s high latitudes. These "night-shining" clouds are beautiful ... photos here.
June 25, 2021
Happy World Oceans Day 2021
World Oceans Day has been celebrated every year on June 8 since 1992. It's a day to raise awareness about how we're connected to the oceans - no matter where we live on Earth - and what we can do to protect ocean habitats.
June 8, 2021
What makes a halo around the sun or moon?
A large ring or circle of light around the sun or moon is called a 22-degree halo by scientists.
June 6, 2021
What are the 2021 hurricane names?
The World Meteorological Organization chooses hurricane names several years in advance. Find hurricane names for 2021 here.
June 1, 2021
See it! May 26, 2021, lunar eclipse photos
Enjoy a few photos of the May 21, 2021 lunar eclipse from EarthSky friends around the world. Thanks so much to all who shared your photos with us!
May 26, 2021
Clouds that look like waves in the sky
Clouds in the sky can sometimes look like ocean waves. These photographic clouds are called Kelvin-Helmholtz clouds, and occasionally also go by the name billow clouds or shear-gravity clouds.
May 25, 2021
