what are the problems that face scientists about space travel (list websites too)?

main problem about space travel is the freely roaming radiation en cosmic rays from explodig stars

en also gravitational pull of massive planets en stars so while travellin u can get pulled

u also hav the demons called the black holes (they hav massive g force en they suck in anythng in there path not even light cannot escape so its also another point.

then u have maybe not sure ALIENS!!!

also the galaxial collision den explosion of stars then sex is prohibited in space because the problems of gravity if u wan more abbt dose log on to (www.nasa.gov)
kkkk cheers

distance / oxygen regeneration while in space

the effects of non gravity on the body after long periods of time .... less gravity makes the ligaments / tendons / muscles relax and muscle atrophy sets in ... also your body begins to uptake less calcium because your bones dont have to be as dense to support your own weight so bone atrophy begins to be a problems

traveling near the speed of light is nearly impossible becuase as things go faster they need to have more mass ... speed of light = infinite mass, which is impossible (einstein and relativity)

if a serious problem occurs how can you be able to fix it possibly without the resources necessary

communication delay (it takes roughly 12 minutes for the mars rover to react to a command from earth ... a lot can happen in that amount of time)


no webistes to list just a lot of discovery channel and physics books