The mature sun may still be prone to temper tantrums. A new study suggests that older stars like the sun can produce superflares: huge bursts of energy visible across hundreds of light-years.
How a Rare Solar 'Superflare' Could Cripple Humanity, by Robert Roy Britt
What if the Carrington Event, the largest solar storm ever recorded, happened today?
The Sun Could Hurl Powerful Storms at Earth From its Goofy Smile - Universe Today
Fifth “dark” force completely change our understanding of the universe
What is a solar flare? - Quora
Giant Sunspot Unleashes Massive Solar Flare
Could the sun emit a killer 'superflare'? Maybe -- a big maybe - CNET
Devastating solar storm 'could send mankind back to Dark Age' in Doomsday forecast - Mirror Online
Extreme Solar Events: Setting up a Paradigm
Solar 'Superflares' Rocked Earth Less Than 10,000 Years Ago--and Could Strike Again