X marks the (sun)spot: How NASA rates the strength of solar flares
What are X flares? Can they harm us?
Rare X-Class Solar Flare Wipes Out Radio Signals in U.S.
NASA SVS | X-Class: A Guide to Solar Flares
Powerful X-Class Solar Flare Erupts From Sun – Captured by NASA's Solar Dynamics Observatory
An X-Class Solar Flare Erupted From Our Sun - SpaceRef
Three X-class flares in 24 hours
Sun emits fourth X-class flare in a week
Sun Unleashes Intense X-Class Solar Flare, With More Blasts Expected - CNET
Bad Astronomy | Solar flares cause massive ripples in and under the Sun's surface | SYFY WIRE
Breathtaking X-Class Solar Flare Bursts From the Sun
NASA Captures the Sun Coughing Out a Thrilling X-Class Solar Flare - CNET
NOAA warns X-class solar flare could hit today, with smaller storms during the week. Here's what to know. - CBS News
Sunspot goes wild! X-class solar flare blasts in our direction
X-rays offer early warning for solar flares
NASA Releases Images of X-class Solar Flare - SpaceRef
anybody else ships Green Shadow with Solar Flare? : r/PlantsVSZombies
ESA - The biggest solar X-ray flare ever is classified as X28
 "Previously Hidden Sunspot Unleashes Powerful X-Class Solar Flare, Causes Radio Blackout Across South Pacific")
Previously Hidden Sunspot Unleashes Powerful X-Class Solar Flare, Causes Radio Blackout Across South Pacific
Major X-class solar flare erupts from sun: What that means for Earth
NASA SVS | X-Class: A Guide to Solar Flares
Largest X-Class Solar Flare: Why It is Impossible for "Killer Solar Flare" to Destroy Earth | Science Times
Sun unleashes monster solar flare, biggest of 2014 - CBS News
NASA's Solar Dynamics Observatory Sees Three Solar Flares
Solar flares: X-class (Yes, that's a real thing.) - CSMonitor.com
