Space Travel Propulsion.

[Dreaming Of Pandora]

Cryogenic stasis for travellers is more realistic yet unrealistic because right now the only thing we can freeze and unfreeze that's still alive is a toad. The human brain seems to break down on a cellular scale when unfrozen so we're a while yet to discover how to keep travellers alive when in cryo.

Interstellar travel is really unrealistic in my opinion. Yeah that's probably pessimistic but space is not space, we know it's not just A to B in an X amount of time, there's so much variables when it comes to space travel and when the distance is large, so are the variables. For instance (and this has slipped the minds of many optimistic people who believe that Mars is achievable right now), solar radiation. Just the few million miles out of Earth orbit can kill travellers because there's no magnetic field to deflect the Sun's deadly radiation. Armstrong and Buzz we're lucky to have survived the Moon Landings as Earth's magnetic field stretches out to the Moon which protected them from much of the solar radiation, there's no protection when in interplanetary travel. Major radiation shielding is needed for travellers to withstand the many months out of the solar system. This is just one of the many problems facing space traversity.