Dark spots on the Sun soar to 23-year high

Experts record a record-breaking number of sunspots on the surface of our home star during the month of August.

Solar Cycle 25 has arrived. Here's what to expect

The sun goes through a regular 11-year cycle, swinging between periods of dormancy and periods of activity. Scientists have just announced that the sun will be ramping up in activity over the next few years.

Second biggest flare of the solar cycle

The leading edge of the first of two major coronal mass ejections will reach Earth at about 1:25 AM EST on the morning of March 8 (plus or minus 7 hours). Such a CME could result in a severe geomagnetic storm, causing aurora at low latitudes, with possible disruption to high frequency radio communication, global positioning systems (GPS), and power grids.