The constant hailstorm of cosmic rays is not the only radiation threat, of course.The sun, too, can unleash tremendous bursts of protons and heavier nuclei traveling at nearly the speed of light.

• 当然，遍布太空的宇宙射线风暴并不是唯一的威胁，太阳也会释放大量质子与重原子核，以接近光速喷出。