Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. An astronomical neutron source is an astronomical source of neutrons. These neutrons can be emitted, spallated, or reflected by an astronomical object. Such an object previously detected say in the visible portion of the electromagnetic spectrum, an astronomical visual source, and later observed with a neutron observatory in orbit around the Earth, or one at high altitude on the surface, is also an astronomical neutron source. Striving to understand the generation of neutrons 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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