A South Polar Pit or an Impact Crater? via NASA https://t.co/euRaUzaquu http://pic.twitter.com/BwNobubcUK
— martinengwicht (@martinengwicht) June 2, 2017
from Twitter https://twitter.com/martinengwicht
learning by doing
A South Polar Pit or an Impact Crater? via NASA https://t.co/euRaUzaquu http://pic.twitter.com/BwNobubcUK
— martinengwicht (@martinengwicht) June 2, 2017
from Twitter https://twitter.com/martinengwicht