Planetary Nebula Abell 78 via NASA https://j.mp/2IxxWnz https://j.mp/2FyQyTd

aki

6年前

Planetary Nebula Abell 78 via NASA https://t.co/QkDy8KDV3L pic.twitter.com/FCVGujWutJ

— Akihiko SHIRAI, Ph.D #VTC20 (@o_ob) October 16, 2020

from Twitter https://twitter.com/o_ob