Space rays — is a natural radioactivity of space, charged particle flux of the high energies, falling to the Earth from the space (primary rays), and also secondary particles flux, born in reactions in the upper strata of atmosphere.

• Space rays. Their composition and origin.
• Space rays data from the site of Russian WDC on Solar-Terrestrial Physics.
• History of space rays observations from station Lesniky, Kyiv. Can be received by agreement with Main Astronomic Observatory NAS of Ukraine by this reference.