Cosmic radiation
Cosmic radiation (also known as cosmic rays) is created in deep space by strong electric and magnetic processes, stripping atoms down to the core and accelerating them to high velocities. Those high energetic particles reach the surface of Mars due to the very thin atmosphere. Like all other ionizing radiation it causes damage to material and health.
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Point of origin
Cosmic radiation strikes bodies in the solar system from all directions, as they permeate the galaxy. They are made of the same particles in the same proportion as those originating from the sun; and are considered part of space weather.[1]. How they are created is debated, but accelerating by matter falling into a black hole, or supernova are two common explanations.
Mitigating Cosmic Rays:
Cosmic rays are blocked by planets, so people on a planet (or in close orbit around one), receive half the cosmic rays that you would in deep space. (The horizon blocks out half the sky, a bit more if you are in a valley.) Cosmic rays (and their Secondary radiation) will penetrate fairly deep thru earth and rock, so only by being deep underground can they be totally eliminated. Experiments on Earth which wish to avoid cosmic rays are done in mines more than 2,000 meters below ground.
That said, people receive cosmic rays everywhere on Earth. People living at high altitudes (which get a higher dose than those living at sea level) show no higher signs of health problems. So trying to eliminate all cosmic rays is impossible and futile. But habitats with a meter of water (or a half meter of soil) between people and the sky would reduce this radiation to levels approaching high altitude regions on Earth.
Acute effects on equipment
A single strike by a cosmic ray can cause three types of error in electronic equipment[1]:
Chronic effects on equipment
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Acute effects on life
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Chronic effects on life
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