. "the theory of a liquid ocean" . . . "5.29" . . . . . . . . . "Europa's surface" . "Europa (moon)" . . "minimal" . "Europa (moon)#Atmosphere" . . "the possibility that Europa could harbor life" . "Europa_(moon)#Subsurface_ocean" . "the ocean on Europa" . . "radiolysis of water molecules" . "Europa_(moon)#Exploration" . "50.0" . . "subsurface ocean" . "1610-01-08" . "Atmosphere of Europa" . "Europa (moon)#Subsurface ocean" . . . "Europa (moon)#Habitability potential" . . . "subsurface ocean of Europa" . . . "102.0" . "Jupiter" . . . "plumes" . . "water beneath its icy surface" . "habitability of Europa" . . . "discovered Europa" . . . "0.03" . . "Europan" . . "Europa (the moon of Jupiter)" . "0.015" . . . "Europa" . . "125.0" . . "8 January 2004" . "Europa (moon)" . "Europan lineae" . "high radiation" . "0.67" . . . "Alien Moon" . . . . . "Europans" . "Europa's" . . "Europa's atmosphere" . .