Looking for a sky event this week? Check out our full Sky This Week column. January 11: Psyche moves north of Aldebaran Io ...
Io orbits so close to Jupiter that gravity alone reshapes its entire surface. Instead of cooling over time, the moon is constantly heated from within, driving relentless volcanic activity. Some ...
"Detecting an exomoon would be quite extraordinary, and because of Io, we know that a volcanic exomoon is possible." When you purchase through links on our site, we may earn an affiliate commission.