Global Change Observation Mission-Climate (GCOM-C) “Shikisai” is a satellite observe global climate change. It was launched on December 23, 2017 by H2A launch vehicle from Tanegashima space center. The Second-generation GLobal Imager (SGLI) on GCOM-C is a multi-channel optical sensor to observe aerosols, vegetation and temperatures. Through long-term monitoring，understanding climate change mechanism will be improved. InfraRed Scanner (IRS) on SGLI has a Thermal InfraRed (TIR) detector. The detector is requested to operate at 55K. A Cooler Dewar Assembly (CDA) was developed to keep the detector at 55K. The CDA is designed to minimize heat load for the small cooler. The detector is supported on thermal isolator made of Glass FRP and thermally connected to the cooler by flexible thermal link. A Cooler Control Electronics (CCE) compensates fluctuation of heat load by using heater to maintain temperature and its stability. Heater power gradually decrease in 5 years. This means decrease of cooling power. Although degradation of the cooler，the detector is successfully kept in temperatures 55±0.1K for 5years in orbit and continue operating with 36W power consumption. This paper describes the cooler Dewar Assembly and its 5 years operation in orbit.

Iwatani Corporation has been engaged in educational activities on promoting a more accurate understanding of the hydrogen energy and environment-related issue to children who will be major players in the next generation. Iwantani also continously host a hydrogen energy forum every year to foster momentum of encouraging broad use for hydrogen energy and to provide many opportunities for someone to work as collaborator. It is important to continue educational activities but there is a limit in the activitiy of one private company. It would be desired for broad industry cooperation and governmental support for the sustained activities.

HTV搭載小型回収カプセル（以下，カプセル）技術実証ミッションでは，2018年11月，日本として初めて，我が国の再突入機による国際宇宙ステーション（以下，ISS）からの宇宙実験サンプルの回収に成功した．カプセルは，こうのとり（以下，HTV）7号機に搭載されて