At 1 G, we feel at home.
At 5 G's, normal people can stay awake.
At 9 G's, trained pilots with G-suits can stay awake.
At 25 G's, R.I.P.
Unfortunately, these numbers are limiting for space travel, especially for the astronaut. For example, if you and I wanted to visit Alpha-Centauri (4.2 light-years away) and come back and tell everyone about our trip, at a comfortable 1 G acceleration and deceleration, our round-trip travel time would be 11.64 earth years and 7.06 rocket years. That's 7 years we'll never get back!
We can't save much on the round-trip travel time by earth's standards (traveling at light speed would only save 3.24 earth years from our previous example's earth time).
However, we can really cut down on our perceived time by accelerating at a faster rate. For example, if we accelerated/decelerated at an uncomfortable 9 G's for the whole trip, while earth's perceived time only drops a little (8.82 years, or 76% of the original time), our perceived time drops to 1.6 very uncomfortable years: just 23% of the original time...nice! At 150 G acceleration, our perceived travel time is only 1 month there and 1 month back!
Obviously, a big problem with our 150 G trip is that under normal circumstances we died 125 G's ago. Thus, my questions are:
- Can we make 150 G's (or other large G amounts) survivable to humans using levitation techniques (for example, I'm worried that your blood might be "locked" into place and thus be unable to pump)? Note that solutions could involve regulating your internal body composition so that each part "pulls its own weight" in the suspension (as opposed to only your stomach being lifted).
- Can we make 150 G's feel like 1 G so that we are not just levitating frogs for our whole trip?