Phoenix received a $1M grant to address extreme urban heat. Here's where to see the innovative shade structures 11 artists ...

Our sun is classified as a G2 medium-sized star. We believe it’s about four billion, 600 million years old, halfway through its lifetime. It burns four million tons of hydrogen every second. The sun ...

Mars and Regulus will remain close to each other until June 22. Now they are not so close to each other, but they can still be seen together with the naked eye. The best time to observe is right after ...

Sunspot region 4114 has unleashed its most powerful solar flare yet — an X1.9 class that erupted late June 19, triggering shortwave radio blackouts across the Pacific Ocean, including parts of Hawaii.

For years, astronomers have been searching for a mysterious ninth planet lurking in the dark outer reaches of our solar ...

A NASA mission to observe the activity of the solar wind has returned its first images of giant coronal mass ejections (CMEs) ...

Sponsored by RxSun If you’ve been thinking about going solar, now is the time to act. Federal tax credits may end by the end ...

Universe's 'missing' matter found! "People are going to be amazed at what we're able to see already." ...

We’ve known for nearly a century that UV radiation is linked to skin cancer, but modern advice about sunburn can be confusing ...

No telescope has basked in the night sky quite like this before. Here's what it could reveal about the universe.