muon

Tag archives for muon

“The results of my observation are best explained by the assumption that a radiation of very great penetrating power enters our atmosphere from above.” -Victor Hess You might think of the largest and most powerful particle accelerators in the world — places like SLAC, Fermilab and the Large Hadron Collider — as the source of…

Why doesn’t Light Age?

There’s a graduate student that I’m sort-of mentoring/working with at Arizona, named Xiaoying Xu (hi Xiao!). She’s bright and curious, and she asks some very good questions. She asked me one yesterday that’s pretty tough to wrap your head around: How do I explain to someone why light doesn’t age? Well, here on Earth, time…