Popular movies portray travel in space as just being a matter of solving simple propulsion problems. The truth is that cosmic radiation is now better understood as a huge risk to space travel. In Scientific American (February 2017, page 54) Charles Limolihas wrote an excellent scientific discussion of the dangers of cosmic radiation.
Galactic cosmic rays are charged atomic nuclei flying at nearly the speed of light, probably coming from the supernova remnants of dead stars. Our Sun generates a great amount of radiation, but the cosmic rays are much more of a hazard. When these atomic nuclei hit molecules in our body, they ionize atoms, knocking electrons off the atoms and causing the atoms to become charged. These charged atoms hit other atoms, and there is a domino effect that is greatly magnified because of the extra energy involved. In human bodies, there are clusters of damage from such radiation, and just trying to duplicate the process in the laboratory has turned out to be incredibly difficult. Limolihas and his fellow researchers have shown that there is a much greater effect on brain tissue than anyone imagined.
The Earth is designed to handle this huge radiation by having two levels of shielding. The Earth’s magnetic field sweeps galactic cosmic rays away from the areas of the planet where most people live, and the atmosphere stops much of the rest. The amount of cosmic radiation we receive on the surface on Earth’s surface is relatively harmless. When you travel in space beyond Earth’s magnetic field, you, have virtually no protection, and that is going to be a huge challenge for space engineers to solve.
The lesson we would bring from this is that God’s design of Earth becomes more and more amazing as we learn of the complexities that have to be taken care of for you and me just to get up in the morning.
–John N. Clayton © 2017