Quote:
Originally Posted by renormalised
It's
That travel time of 20 minutes for the 12 million Ly between Centaurus A and the earth was for a cosmic ray of extremely high energy. That's all the time it experiences in that distance due to time dilation.
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I read the same article. They said the particle packed the punch of a baseball travelling at something like 100kph...as I recall? Boy, would that give you a headache. You come in to work in the morning with a black eye and everyone asks you what happened. "I got hit in the head by a cosmic ray!"
