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Posts by
Editors of EarthSky
Astro festivals, star parties, workshops
Summertime is a great time for star parties, in part because, at this time of year, we can see toward the galaxy's center. Plus it's the best time to see Saturn now, and Mars will be bright this summer. Join in, and have fun!
June 25, 2018
Top 10 things about brown recluse spiders
It's their active season. Here are some things you might not know.
April 6, 2018
The colors of stars
A photographer compares the colors of the stars Rigel, Betelgeuse and Sirius.
March 28, 2018
Find Vincent van Gogh’s Big Dipper
Here's an easy astronomy lesson, from a master in the art of loving nature.
March 23, 2018
Use Big Dipper to find Little Dipper
The Big Dipper is easy to recognize, but the Little Dipper ... not so much. Here's a tip that can help.
March 11, 2018
Blue-white Rigel at Orion’s foot
Rigel is far, some 775 light-years away. It must be extraordinarily luminous to be so distant yet shine so brightly in our sky.
February 12, 2018
Somber Betelgeuse in Orion’s shoulder
Betelgeuse's red color indicates a star well into the autumn of its years. In fact, the star is a magnificently rare red supergiant.
February 11, 2018
What is radiocarbon dating?
At a very steady rate, unstable carbon-14 gradually decays to carbon-12. The ratio of these carbon isotopes reveals the ages of some of Earth's oldest inhabitants.
February 9, 2018
See it! Super Blue Moon eclipse photos
It was a Blue Moon, a supermoon and a moon in total eclipse. EarthSky community members around the world came through as always with awesome photos.
January 31, 2018
Ocean plastic killing marine turtles
Hundreds of marine turtles die every year after getting tangled in trash - such as plastic ‘six pack’ holders and discarded fishing gear - in oceans and on beaches.
January 7, 2018
