Solar Cycle 25 Begins via NASA https://j.mp/3iDLTxF https://j.mp/32EgZ2q

aki

5年前

Solar Cycle 25 Begins via NASA https://t.co/xs6wBbCmTJ pic.twitter.com/ib4ubFOnok

— Akihiko SHIRAI, Ph.D #VTC20 (@o_ob) September 17, 2020

from Twitter https://twitter.com/o_ob