Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. An astronomical cosmic-ray source is an astronomical source of cosmic rays. These rays can be emitted, fluoresced, or reflected by an astronomical object. Such an object previously detected say in the visible portion of the electromagnetic spectrum and later observed with a cosmic-ray observatory in orbit around the Earth is also an astronomical cosmic-ray source. Striving to understand the generation of cosmic rays by the apparent source helps to understand the Sun, the universe as a whole, and how these affect us on Earth.

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