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Cosmic - rays are so dangerous and so poorly understood that people are unlikely to get to Mars or even back to the moon until better ways are found to protect astronauts. They have many kinds of Cosmic – rays in the universe. Cosmic – rays are effects on role in ambient radiation, lightning, climate change and significance to space travel. Generally, when we talk about Cosmic – rays are Solar Cosmic rays. This Solar cosmic –rays are the reason why we can’t go to Mars. The Earth's bulk, atmosphere and magnetic field protect life from the solar radiation and the cosmic rays that travel through space. Astronauts have just a thin layer of shielding. So Mars can’t protect the Cosmic – rays. And the cosmic rays include galactic cosmic radiation or GCR and solar particles. The reason why it’s so dangerous, the cosmic rays take years for the damage to cause disease. Ejections of dangerous particles from the sun can be forecast, but astronauts must hide in specially shielded areas of shuttles or space stations and may miss important tasks. And the radiation poses cancer and other health risks for years after astronauts return to Earth. As a result, it’s going to be take some time to people go to Mars or build the city in Mars. But we can still go to Moon with spend lots of money.