Acknowledgement
This paper is based on my presentation at the third colloquium of Beyond the Moon (BtM, 심우주탐사연구연합회) held at Satellite Technology Research Center (SaTReC), Korea Advanced Institute of Science and Technology (KAIST) on September 28, 2021. I thank the organizers of the colloquium and an editor of this journal (Dr. Hae-Dong Kim) for inviting me to the colloquium and this paper, respectively. This work was supported by Korea Astronomy and Space Science Institute under the R&D program (2022-1-850-09) supervised by the Ministry of Science and ICT.
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