If one were standing on a body that is part of a binary system such as Pluto/Charon, would the g-forces of the motion of the planet be perceptible by a human?

  • 2
    $\begingroup$ What do you mean by perceptible? Astronomically observable? Measurable on a lab experiment? Perceptible g-forces on humans? $\endgroup$ Commented Feb 5, 2013 at 18:58
  • $\begingroup$ I have updated the question. $\endgroup$
    – trpt4him
    Commented Feb 5, 2013 at 21:50
  • $\begingroup$ Then zhermes' answer applies. Humans feel g-forces of order 1 g (unless they change suddenly). Assuming the planet has Earth-like surface gravity, that puts the planet pretty near the Roche limit. $\endgroup$ Commented Feb 6, 2013 at 10:10

1 Answer 1


Assuming you mean, 'could a person feel it?' - then no. To be able to feel the effect of the motion, the system would have to be near break-up (with the surface near the Roche/Tidal limit), which never really happens for binary-planets.

For a planet very near a star, it could be perceptible... but in most cases you'd be burned up (etc) due to the close proximity to the star.


Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Not the answer you're looking for? Browse other questions tagged or ask your own question.