A daily update by email. Science news, great photos, sky alerts.
A large ring or circle of light around the sun or moon is called a 22-degree halo. They are caused by high, thin cirrus clouds drifting high above your head.
We get many messages throughout each year from people who’ve just spotted a halo, or ring, around the sun or moon.
Solar halo seen in Indianapolis, Indiana by Jolynn Keutzer Bales. Thank you Jolynn!
Did you get to see epic AR3590? If not, here's the story of a sunspot that has made history! And check out our YouTube videos as well.
Sun activity archive for February 2024. A daily record of flaring, big filaments and prominences, and other sorts of activity, on our local star.
Sun activity archive for January 2024. A daily record of flaring, big filaments and prominences, and other sorts of activity, on our local star.
Sun activity archive for December 2023. A daily record of flaring, big filaments and prominences, and other sorts of activity, on our local star.
Sun activity archive for November 2023. A daily record of flaring, big filaments and prominences, and other sorts of activity, on our local star.
Sun activity archive for September 2023. A daily record of flaring, big filaments and prominences, and other sorts of activity, on our local star.
Sun activity archive for July 2023. A daily record of flaring, big filaments and prominences, and other sorts of activity, on our local star.
Sun activity archive for June 2023. A daily record of flaring, big filaments and prominences, and other sorts of activity, on our local star.
Sun activity archive for May 2023. A daily record of flaring, big filaments and prominences, and other sorts of activity, on our local star.
Sun activity archive for April 2023. A daily record of flaring, big filaments and prominences, and other sorts of activity, on our local star.
Sun activity archive for March 2023. A daily record of flaring, big filaments and prominences, and other sorts of activity, on our local star.
NASA's Curiosity rover has captured our 1st clear image of crepuscular rays or sunrays on Mars. The rover also caught cloud iridescence on Mars.
On February 11, 2010, a solar observatory that launched into space ripped apart a sundog and created a new ice halo that amazed scientists.
The active sun is frequently in the news as Solar Cycle 25 ramps up. Here's a handy sun glossary so you can get up to speed on all the solar terms you'll see.
Corona around the sun, caused by thin clouds in front of the sun, or perhaps pollen, after the devastating Marshall Fire in Boulder County, early January 2022.
Eliot Herman in Tucson, Arizona, took an incredibly rare moon halo photo during the partial lunar eclipse on November 19, 2021.
Aurora alert in effect for the next few days: the sun sent out a halo coronal mass ejection on November 2, 2021, due to arrive at Earth on November 4.