add sections on spaceflight, and on how legal ownership of regions space is banned (due to the Outer Space Treaty)
the "Effect on human bodies" section should also cover the effects of microgravity; the scope could also be expanded to cover life forms in general, particularly in terms of panspermia.
the "Interstellar" section should cover some of the aspects of astrochemistry and molecules in the ISM.
the "Earth orbit" section orbital conditions apply only to a circular orbit. Perhaps adding "at its perihelion" would fix.
Cleanup :the references that need it, and replace ones that have gone dead with new ones
Verify :add references wherever it seems necessary
