Behold! Observing the Sun via NASA https://t.co/JKB32OINmm http://pic.twitter.com/Sap9ZTkz4m
— martinengwicht (@martinengwicht) November 20, 2017
from Twitter https://twitter.com/martinengwicht
learning by doing
Behold! Observing the Sun via NASA https://t.co/JKB32OINmm http://pic.twitter.com/Sap9ZTkz4m
— martinengwicht (@martinengwicht) November 20, 2017
from Twitter https://twitter.com/martinengwicht