I hope the reader will have been convinced that noble gases provide important constraints on the mantle structure and on the origin of volatiles on terrestrial planets. I have attempted to give the reader some information on how noble gases are essential, although not unique of course, to address the issue of the origin of planetary atmospheres (here, terrestrial planets, but also giant planets). Some results and interpretation can be considered as established and unanimously accepted by the community; some others are still debated and require further work to be confirmed or invalidated. Below is a series of questions that,...

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