How We'll Safeguard Earth From a Solar Storm Catastrophe
Radiation From Solar Activity | US EPA
Sunspots | Center for Science Education
1 in 8 Chance of Catastrophic Solar Megastorm by 2020 | WIRED
The Solar Cycle | NOAA SciJinks – All About Weather
Photos Show Huge Swarm of Sunspots Big Enough to Swallow Earth
Sunspot maximum | astronomy | Britannica
A sun with no sun spots? What that could mean for Earth and its climate. - CSMonitor.com
NASA caught the sun smiling down on us, literally : NPR
How the Sun Get Its Spots: New Theory Proposed for Solar Mystery | Space
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The Sun and Sunspots
Earth Pummeled by Solar Storms As More Sunspots Appear on Sun's Surface
Solar activity | SpaceWeatherLive.com
Sunspot - Wikipedia
Sun activity: A mixed-up sunspot
What Will Solar Cycle 25 Look Like? | NASA
Sunspot - Wikipedia
Sunspots and Solar Flares | NASA Space Place – NASA Science for Kids
What are solar flares? | Live Science
Sunspots: What are they, and why do they occur? | Space
Sunspots/Solar Cycle | NOAA / NWS Space Weather Prediction Center
Solar flare risk high as "violent" part of sun faces Earth
Solar Flares, Sunspots, and the Solar Cycle — The Wonder of Science
