Hanju Nam(Department of Earth Science Education, Seoul National University, Republic of Korea)
Woojin Kwon(Department of Earth Science Education, Seoul National University, Republic of Korea, SNU Astronomy Research Center, Seoul National University, Gwanak-ro 1, Gwanak-gu, Seoul, 08826, Korea, The Center for Educational Research, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 08826, Republic of Korea)
Youngwoo Choi(Department of Physics and Astronomy, Seoul National University, Seoul 08826, Republic of Korea)