Add Yahoo as a preferred source to see more of our stories on Google. This year has given stargazers plenty of opportunities to catch the colorful auroras of the northern lights flicker across the ...

The intensity of the Sun’s activity ebbs and flows across years, but also across decades—a behavior that scientists haven’t quite figured out yet. At the turn of the 21 st century, astrophysicists ...

The sun has become more and more active over the last 16 years, in a turn that surprised scientists and could affect space weather and technology on Earth, NASA announced this week. A new research, ...

The sun has become increasingly active since 2008, a new NASA study shows. Solar activity is known to fluctuate in cycles of 11 years, but there are longer-term variations that can last decades. Case ...

The colossal ball of hot gas at the center of our solar system will be lively for the next year, NASA said. The sun has reached its "solar maximum period," which is a state of heightened activity in ...

"More than a century of historic Ca II K observations from the Kodaikanal Solar Observatory offer a unique window into the polar magnetic field of the sun, a key factor governing solar cycles and ...