Physics (10th Edition)

The space traveler's mass is always $115kg$ no matter where he is. On earth, his weight is $1127N$, but in space where there are no nearby planetary objects, his weight is $0$
1) Mass is always constant. Therefore, either on earth or anywhere else in space, the traveler's mass is always $115kg$. 2) On earth, gravitational acceleration $g=9.8m/s^2$. Therefore, the weight of the traveler is $$mg=115\times9.8=1127N$$ The presence of gravitational acceleration requires at least an attractive force from one body nearby. In other words, in space where there are no nearby planetary objects, gravitational acceleration $g=0$ Thus, the weight of the traveler will be $0$.