via NASA https://j.mp/2EMr6sM https://j.mp/3bl1X4d

aki

5年前

via NASA https://t.co/FD7yoUbLa9 pic.twitter.com/IEsmn56ZAe

— Akihiko SHIRAI, Ph.D #VTC20 (@o_ob) September 2, 2020

from Twitter https://twitter.com/o_ob