Maria's Mass Maria's Weight Planet 60 kg 321 Newtons Mars
60 kg 588 Newtons Earth
60 kg 661 Newtons Neptune
60 kg 1390 Newtons Jupiter
According to the chart above, why is Maria's mass the same on all the planets?

"six months ago, several of molly's friends joined the trimtime fitness center. each of them participated in trimtime's weight-reduction and fitness regimen. all reported substantial weight reduction, and all are visibly slimmer. molly is convinced. she joins trimtime and enrolls in the program, hoping and expecting to see the same results. she is especially delighted to learn that trimtime had adjusted its program to make it even more effective in a shorter period of time." what is the feature in question/attribute of interest in this argument?