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Some Cosmic Rays Come from Outside the Galaxy

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Some Cosmic Rays Come from Outside the Galaxy


Astronomers have detected more extremely energetic cosmic particles coming from one side of the sky than the other.

Particles traveling at fair fractions of the speed of light hit Earth all the time. These ridiculously energetic entities, called cosmic rays, are protons and larger atomic nuclei from space. Their energies range from about a billion to beyond 10 million trillion electron volts (109 to 1020 eV), or up to 10 million times higher than the energy at which the Large Hadron Collider smashes protons together. (Incidentally, this is why we know the LHC won’t create dangerous microscopic black holes.)

arrow3.gif  Read More: Sky and Telescope


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