[Erasmus]

The interaction of cosmic rays with the atmosphere creates a continuous shower of muons - tiny, charged particles that travel dozens of miles in the millionth of a second that they exist.

Hmmm. That would mean that they're travelling at least 129 times the speed of light.

[Drammach]

Hmmm. That would mean that they're travelling at least 129 times the speed of light.

The muons have a half-life of 2.2 microseconds. At the speed of light this would give a range of only 660 m. However, at relativistic speeds, the lifetime of the muon, as we perceive it, is much longer. Given a minimal 2 GeV muon (rest mass = 0.1 GeV):

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