"Are we alone in the universe?" is the fundamental question of mankind. To search for the life signaturesin the universe, there have been a lot of researches and space explorations, especially in our solar system. In this review paper, we introduce the de nition and characteristics of the \biosignature". The currentsituations and future plans for searching for biosignatures in our solar system are reviewed, especially atVenus, Mars, and Ocean Worlds such as Europa and Enceladus where life signatures are more likely toexist than in other places in the solar system. Finally, we discuss the opportunities and strategies for theKorean scienti c society to participate in searching for biosignatures in the solar system.

In this study, we developed a learning progression for the structure of the solar system using multi-tier supply form items and validated its appropriateness. To this end, by applying Wilson’s (2005) construct modeling approach, we set up ‘solar system components,’ ‘size and distance pattern of solar system planets,’ and ‘solar system modeling’ as the progress variables of the learning progression and constructed multi-tier supply form items for each of these variables. The items were applied to 150 fifth graders before and after the classes that dealt with the ‘solar system and star’ unit. To describe the results of the assessment, the students’ responses to each item were categorized into five levels. By analyzing the Wright map that was created by applying the partial credit Rasch model, we validated the appropriateness of the learning progression based on the students’ responses. In addition, the validity of the hypothetical pathway that was established in the learning progression was verified by tracking changes in the developmental level of students before and after the classes. The results of the research are as follows. The bottom-up research method that used multi-tier supply form items was able to elaborately set the empirical learning progression for the conceptualization of the structure of the solar system that is taught in elementary school. In addition, the validity of the learning progression was high, and the development of students was found to change with the learning progression.

이 연구의 목적은 고등학생들의 태양계 상대적인 크기를 쉽게 이해하고 창의적인 사고 능력을 키우기 위한 교육 프로그램 개발이다. 프로그램은 태양계의 상대적 크기 영역에서 4개 주제와 8차시 분량으로 개발되었다. 개발된 프로그램은 구미시에 소재한 G 고등학교 10학년 155명에게 투입하였다. 연구 결과를 살펴보면, 개발된 프로그램 학습을 통해 학생들이 태양계 행성들의 상대적인 크기를 쉽게 이해할 수 있었고, 발산적 사고로부터 수렴적 사고로 이어지는 창의적 사고력을 향상 시켰다. 개발된 프로그램의 주제별 활동을 통하여 학생들에게 창의적 사고 능력의 배양과 태양계내의 행성간 거리와 크기에 대해 쉽게 학습시킬 수 있을 것으로 기대된다.

The DE405 ephemeride is introduced as TRAO solar ephemeris system to support the apparent coordinates of planets after 2000. The time delay between planets and observer has to be regarded to get the apparent position of planet. Some fast algorithms about time delay are suggested to reduce the computing time. The CSI method is applied to run these algorithms on any O/S including both real-time and run-time machine.