When our sun was young, it was a very nasty star that erupted with “superflares” and blowtorched the inner solar system with powerful solar winds. Fortunately, the sun finally grew up and mellowed, reaching the calm(er) state it is now.
For early life on Earth, our planet’s magnetosphere likely provided much-needed protection against the stellar onslaught, facilitating the evolution of our thriving biosphere. And through the study of a nearby young sun-like star called Kappa Ceti, we now know how lucky we are to have such an effective global magnetic field.
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Source Credits: Ian O’Neill in Discovery News Astronomy