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Posts by
Editors of EarthSky
2021 moon phases, with distances from Earth
2021 moon phases in a chart format. Dates closest to new moon provide the darkest skies and the best opportunities for stargazing and meteor-watching.
July 30, 2021
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
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
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
Listen: Have aliens already visited us?
A podcast featuring Harvard theoretical physicist Avi Loeb, on the subject of whether 'Oumuamua - the strange object that swept through our solar system in 2017 - is an artifact of an alien intelligence.
May 16, 2021
Photos of the supermoon, April 2021
The first of 2 spring supermoons in 2021 took place on April 26 or 27 (depending on your location on Earth). We received many wonderful submissions from you, our readers. Here's a gallery of some favorites. Thanks to all who submitted!
April 27, 2021
When is the next tide? Recommended almanacs here
The EarthSky-recommended tide almanacs listed here are based on astronomical influences on the tides. They'll help you in finding the next high and low tides.
April 25, 2021
Sunlight through trees in Singapore
When sunlight filters through trees, you may get a corona effect where the rays from the light sources take on the colors of the rainbow.
April 14, 2021
Is the Hyades star cluster being destroyed?
Data from ESA’s Gaia star-mapping satellite have revealed tantalizing evidence that the famous V-shaped Hyades - nearest star cluster to our sun - is being disrupted. The culprit may be a suspected population of dark matter sub-halos. Wow!
April 2, 2021
