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Opinion

Cosmic Rays: 100 Years Of Mystery

An artist's impression of the <a href=&quot;http://www.eso.org/public/news/eso1229/&quot;>quasar 3C 279</a>, about five billion light years away. This quasar contains a black hole with a mass about one billion times that of the sun. (ESO)
An artist's impression of the quasar 3C 279, about five billion light years away. This quasar contains a black hole with a mass about one billion times that of the sun. (ESO)

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