Sign Up for Our Amazing Newsletter!
A daily update by email. Science news, great photos, sky alerts.
Thank you! Your submission has been received!
Oops! Something went wrong while submitting the form.
Posts by
Editors of EarthSky
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
Celebrating the Pleiades, or Seven Sisters
Photos from Project Nightflight and others in the EarthSky community of the famous star cluster Pleiades. Look for this tiny, misty dipper in your night sky.
December 30, 2017
Meet the Dog Stars
Dog Star Sirius is our sky's brightest star. Dog Star Procyon isn't as bright, but it's easy to spot. Say howdy to these 2 tonight!
December 6, 2017
What would Earth be like with no moon?
Earth without its moon would be a very different world indeed. No eclipses. Smaller tides. But the biggest change would be in the length of Earth's day.
December 3, 2017
A farewell to Saturn
Two days before it plunged into Saturn's atmosphere last September 15, the Cassini spacecraft returned this final, full mosaic image of the planet.
November 22, 2017
Asteroids photobomb distant galaxies
The Hubble Space Telescope captured nearby asteroids photobombing distant galaxies
November 4, 2017
