Why Earthlings are safe when huge solar storms strike our planet

From time to time, the sun discharges billions of tons of solar matter, traveling millions of miles per hour, straight at Earth. Yet humans and life on the surface aren't physically harmed by the intense space radiation. That's why, when the strongest solar impact to occur in over 20 years recently hit, you may have been blithely unaware — except for the resulting atmospheric light show, as magnificent glowing auroras appeared in unusual places.Not all worlds, like the moon and Mars, have