Final answer:
The weight of a 70 kg astronaut on Earth is 686 N, on the Moon is 119 N, on Venus is 609 N, and in outer space is 0 N.
Step-by-step explanation:
The weight of an object is the force due to gravity acting upon that object's mass. It is calculated by multiplying the mass of the object by the acceleration due to gravity (g) at the location where the object is.
a. On Earth, the weight of a 70 kg astronaut is calculated using the standard Earth gravity of 9.8 m/s², so the weight W is W = m*g = 70 kg * 9.8 m/s² = 686 N.
b. On the moon, where g = 1.7 m/s², the astronaut's weight is W = m*g = 70 kg * 1.7 m/s² = 119 N.
c. On Venus, where g = 8.7 m/s², the astronaut's weight is W = m*g = 70 kg * 8.7 m/s² = 609 N.
d. In outer space, far from any significant gravity field, an astronaut would be effectively weightless, so their weight would be 0 N.