What is the weight of a 69 kg astronaut in the following locations?

Question

in outer space traveling with constant velocity

Answer 1

In outer space means there is no gravity, also traveling with constant velocity means that total force acting on astronaut is zero.

So the weight is zero (not the mass, that is 69Kg, only the weight is zero)

Answer 2

Constant velocity means no acceleration.  No acceleration means he has no weight, weight = m*a    no  a, no weight.

Answer 3

unknown.

But if he is not close to any planets or suns, it should be close to zero.

But if he is near Earth, for example, he could be using a rocket to counteract it's gravity, and thus be moving at constant velocity, and subject to it's gravity.

No one seems to agree with me. Let me give you an example.

Consider an astronaut stationary to the earth, ie, not in orbit, not in free fall, held in place by a space elevator, or a rocket pointing straight down.  He has zero velocity with respect to earth, and zero velocity is certainly a constant velocity.

This astronaut will feel Earth's gravity, and his weight will NOT be zero. It will be less than 69 kg because of distance, but not zero.

"outer space means there is no gravity" is absolutely wrong, there is gravity everywhere in the universe.

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