The Sun's activity is rising again after decades of decline, surprising scientists and raising concerns about space weather.

In a new study published in The Astrophysical Journal Letters, NASA researchers reveal that the Sun — long believed to be ...

NASA scientists have determined that the Sun has increased in solar activity, defying expectations that it would enter a more ...

At the turn of the 21 st century, astrophysicists theorized that the Sun was headed toward a deep solar minimum, but a new study says that the Sun’s activity actually reversed course around 2008. This ...