A trip to Phobos comes with extras (Image: NASA/JPL)
FORGET the risk of exploding rockets or getting sideswiped by a wayward bit of space junk. Radiation may be the biggest hurdle to human exploration beyond low-Earth orbit and could put a damper on a recently proposed mission to Mars orbit.
A tasked by the White House with reviewing NASA’s human space flight activities (Â鶹´«Ã½, 22 August, p 8) suggests sending astronauts to one of Mars’s moons, Phobos or Deimos, among other possibilities raised in its released last week ().
From such a perch, astronauts could use…
