The History of Our Galaxy Buried Under Our Feet

Rock core samples may carry marks made by cosmic rays up to billions of years old.

 Scientists have figured out a way to look into our galactic past and the proposed method 

 It involves digging up salt crystals from miles underground. A paper describing the approach was recently

Astronomers look into the past by staring deep into space and observing light that has taken billions 

Our sun, for instance, is known to be much less active than similar stars

The typical sun-like star has a variation in radiation output of maybe a percent or so

 an astrophysicist from the University of Delaware in Newark who was not involved in the latest paper

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