this is interesting, thanks for the reference, but it doesn't seem affordable for average citizens: "The main error sources that impact the instrument design a

this is interesting, thanks for the reference, but it doesn't seem affordable for average citizens: "The main error sources that impact the instrument design are the number of collected photons (related to the detector size and the integration time) and the timing accuracy." Detecting and filtering for appropriate X-rays would seem to require a large and thus expensive detector. Being able to self-locate during aerobraking (as described in following URL) is a very neat application though... https://web.archive.org/web/20170316044511/http://gsp.esa.int/documents/10192/43064675/C4000106174ExS.pdf/8a26a304-9d5f-447d-aa75-bc0c955a4b78 https://web.archive.org/web/20170316044511/http://gsp.esa.in... I wonder what materials withstand the heat and plasma during aerobraking, yet are transparent enough for X-rays?