Editing Space weather (section)

===Humans in space===
{{Main|Effect of spaceflight on the human body}}

The exposure of a human body to [[ionizing radiation]] has the same [[acute radiation syndrome|harmful effects]] whether the source of the radiation is a medical [[X-ray machine]], a [[nuclear power plant]], or radiation in space. The degree of the harmful effect depends on the length of exposure and the radiation's [[energy density]]. The ever-present [[radiation belt]]s extend down to the altitude of crewed spacecraft such as the [[International Space Station#Radiation|International Space Station]] (ISS) and the [[Space Shuttle]], but the amount of exposure is within the [[Spaceflight radiation carcinogenesis#Current Permissible Exposure Limits|acceptable lifetime exposure limit]] under normal conditions. During a major space weather event that includes an SEP burst, the [[flux]] can increase by orders of magnitude. Areas within ISS provide shielding that can keep the total dose within safe limits.<ref>{{Cite web|title = Space station radiation shields 'disappointing' - New Scientist|url = https://www.newscientist.com/article/dn2956-space-station-radiation-shields-disappointing.html|access-date = 2015-07-24}}</ref> For the [[Space Shuttle]], such an event would have required immediate mission termination.