1. I have to calculate the weight of an astronaut, whose mass is 72 Kg on the surface of different planets, but in the table telling me the Acceleration due to gravity (or Gravitational Field Strength) it there is also a column about whether the planet has an atmosphere. Is that relevant? 2. Relevant equations - Weight (N) = Mass (Kg) X Acceleration (M/s2) 3. I need to know if the atmosphere thing is relevant? I am ignoring it so far! Thank You so Much!