Cosmic radiation is a form of energy that travels through space from all directions of the universe. In this paper we look at what cosmic radiation is, its types and penetrating power, and what fraction of all radiation it is. How it affects us - irradiation, dose. Can we protect ourselves from it. Our planet has two very valuable shields that protect us from solar radiation and cosmic radiation outside the boundaries of our solar system: the atmosphere and the Earth's magnetic field. It is our concern and duty to protect the Planet as well.